---
title: Logstash breaking changes
description: Breaking changes can impact your Elastic applications, potentially disrupting normal operations. Before you upgrade, carefully review the Logstash breaking...
url: https://www.elastic.co/elastic/docs-builder/docs/2659/release-notes/logstash/breaking-changes
products:
  - Logstash
---

# Logstash breaking changes
Breaking changes can impact your Elastic applications, potentially disrupting normal operations.
Before you upgrade, carefully review the Logstash breaking changes and take the necessary steps to mitigate any issues.

## 9.0.0

<dropdown title="Changes to SSL settings in Logstash plugins">
  We’ve removed deprecated SSL settings in some Logstash plugins, and have replaced them with updated settings. If your plugin configuration contains any of these obsolete options, the plugin may fail to start.
  <dropdown title="logstash-input-beats">
    | Setting           | Replaced by                                                                                                                                                               |
    |-------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | cipher_suites     | [`ssl_cipher_suites`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-beats#plugins-inputs-beats-ssl_cipher_suites)                 |
    | ssl               | [`ssl_enabled`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-beats#plugins-inputs-beats-ssl_enabled)                             |
    | ssl_peer_metadata | `ssl_peer_metadata` option of [`enrich`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-beats#plugins-inputs-beats-enrich)         |
    | ssl_verify_mode   | [`ssl_client_authentication`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-beats#plugins-inputs-beats-ssl_client_authentication) |
    | tls_min_version   | [`ssl_supported_protocols`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-beats#plugins-inputs-beats-ssl_supported_protocols)     |
    | tls_max_version   | [`ssl_supported_protocols`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-beats#plugins-inputs-beats-ssl_supported_protocols)     |
  </dropdown>

  <dropdown title="logstash-input-elastic_agent">
    | Setting           | Replaced by                                                                                                                                                                               |
    |-------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | cipher_suites     | [`ssl_cipher_suites`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-elastic_agent#plugins-inputs-elastic_agent-ssl_cipher_suites)                 |
    | ssl               | [`ssl_enabled`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-elastic_agent#plugins-inputs-elastic_agent-ssl_enabled)                             |
    | ssl_peer_metadata | `ssl_peer_metadata` option of [`enrich`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-elastic_agent#plugins-inputs-elastic_agent-enrich)         |
    | ssl_verify_mode   | [`ssl_client_authentication`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-elastic_agent#plugins-inputs-elastic_agent-ssl_client_authentication) |
    | tls_min_version   | [`ssl_supported_protocols`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-elastic_agent#plugins-inputs-elastic_agent-ssl_supported_protocols)     |
    | tls_max_version   | [`ssl_supported_protocols`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-elastic_agent#plugins-inputs-elastic_agent-ssl_supported_protocols)     |
  </dropdown>

  <dropdown title="logstash-input-elasticsearch">
    | Setting                      | Replaced by                                                                                                                                                                                   |
    |------------------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | ca_file                      | [`ssl_certificate_authorities`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-elasticsearch#plugins-inputs-elasticsearch-ssl_certificate_authorities) |
    | ssl                          | [`ssl_enabled`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-elasticsearch#plugins-inputs-elasticsearch-ssl_enabled)                                 |
    | ssl_certificate_verification | [`ssl_verification_mode`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-elasticsearch#plugins-inputs-elasticsearch-ssl_verification_mode)             |
  </dropdown>

  <dropdown title="logstash-input-elastic_serverless_forwarder">
    | Setting | Replaced by                                                                                                                                                                                 |
    |---------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | ssl     | [`ssl_enabled`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-elastic_serverless_forwarder#plugins-inputs-elastic_serverless_forwarder-ssl_enabled) |
  </dropdown>

  <dropdown title="logstash-input-http">
    | Setting           | Replaced by                                                                                                                                                             |
    |-------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | cipher_suites     | [`ssl_cipher_suites`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http#plugins-inputs-http-ssl_cipher_suites)                 |
    | keystore          | [`ssl_keystore_path`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http#plugins-inputs-http-ssl_keystore_path)                 |
    | keystore_password | [`ssl_keystore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http#plugins-inputs-http-ssl_keystore_password)         |
    | ssl               | [`ssl_enabled`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http#plugins-inputs-http-ssl_enabled)                             |
    | ssl_verify_mode   | [`ssl_client_authentication`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http#plugins-inputs-http-ssl_client_authentication) |
    | tls_max_version   | [`ssl_supported_protocols`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http#plugins-inputs-http-ssl_supported_protocols)     |
    | tls_min_version   | [`ssl_supported_protocols`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http#plugins-inputs-http-ssl_supported_protocols)     |
    | verify_mode       | [`ssl_client_authentication`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http#plugins-inputs-http-ssl_client_authentication) |
  </dropdown>

  <dropdown title="logstash-input-http_poller">
    | Setting             | Replaced by                                                                                                                                                                               |
    |---------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | cacert              | [`ssl_certificate_authorities`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http_poller#plugins-inputs-http_poller-ssl_certificate_authorities) |
    | client_cert         | [`ssl_certificate`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http_poller#plugins-inputs-http_poller-ssl_certificate)                         |
    | client_key          | [`ssl_key`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http_poller#plugins-inputs-http_poller-ssl_key)                                         |
    | keystore            | [`ssl_keystore_path`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http_poller#plugins-inputs-http_poller-ssl_keystore_path)                     |
    | keystore_password   | [`ssl_keystore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http_poller#plugins-inputs-http_poller-ssl_keystore_password)             |
    | keystore_type       | [`ssl_keystore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http_poller#plugins-inputs-http_poller-ssl_keystore_password)             |
    | truststore          | [`ssl_truststore_path`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http_poller#plugins-inputs-http_poller-ssl_truststore_path)                 |
    | truststore_password | [`ssl_truststore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http_poller#plugins-inputs-http_poller-ssl_truststore_password)         |
    | truststore_type     | [`ssl_truststore_type`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-http_poller#plugins-inputs-http_poller-ssl_truststore_type)                 |
  </dropdown>

  <dropdown title="logstash-input-tcp">
    | Setting    | Replaced by                                                                                                                                                                                                                                                                                                                                                               |
    |------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | ssl_cert   | [`ssl_certificate`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-tcp#plugins-inputs-tcp-ssl_certificate)                                                                                                                                                                                                                         |
    | ssl_enable | [`ssl_enabled`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-tcp#plugins-inputs-tcp-ssl_enabled)                                                                                                                                                                                                                                 |
    | ssl_verify | [`ssl_client_authentication`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-tcp#plugins-inputs-tcp-ssl_client_authentication) in `server` mode and [`ssl_verification_mode`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-inputs-tcp#plugins-inputs-tcp-ssl_verification_mode) in `client` mode |
  </dropdown>

  <dropdown title="logstash-filter-elasticsearch">
    | Setting           | Replaced by                                                                                                                                                                                     |
    |-------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | ca_file           | [`ssl_certificate_authorities`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-elasticsearch#plugins-filters-elasticsearch-ssl_certificate_authorities) |
    | keystore          | [`ssl_keystore_path`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-elasticsearch#plugins-filters-elasticsearch-ssl_keystore_path)                     |
    | keystore_password | [`ssl_keystore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-elasticsearch#plugins-filters-elasticsearch-ssl_keystore_password)             |
    | ssl               | [`ssl_enabled`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-elasticsearch#plugins-filters-elasticsearch-ssl_enabled)                                 |
  </dropdown>

  <dropdown title="logstash-filter-http">
    | Setting             | Replaced by                                                                                                                                                                   |
    |---------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | cacert              | [`ssl_certificate_authorities`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-http#plugins-filters-http-ssl_certificate_authorities) |
    | client_cert         | [`ssl_certificate`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-http#plugins-filters-http-ssl_certificate)                         |
    | client_key          | [`ssl_key`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-http#plugins-filters-http-ssl_key)                                         |
    | keystore            | [`ssl_keystore_path`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-http#plugins-filters-http-ssl_keystore_path)                     |
    | keystore_password   | [`ssl_keystore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-http#plugins-filters-http-ssl_keystore_password)             |
    | keystore_type       | [`ssl_keystore_type`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-http#plugins-filters-http-ssl_keystore_type)                     |
    | truststore          | [`ssl_truststore_path`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-http#plugins-filters-http-ssl_truststore_path)                 |
    | truststore_password | [`ssl_truststore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-http#plugins-filters-http-ssl_truststore_password)         |
    | truststore_type     | [`ssl_truststore_type`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-filters-http#plugins-filters-http-ssl_truststore_type)                 |
  </dropdown>

  <dropdown title="logstash-output-elasticsearch">
    | Setting                      | Replaced by                                                                                                                                                                                     |
    |------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | cacert                       | [`ssl_certificate_authorities`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-elasticsearch#plugins-outputs-elasticsearch-ssl_certificate_authorities) |
    | keystore                     | [`ssl_keystore_path`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-elasticsearch#plugins-outputs-elasticsearch-ssl_keystore_path)                     |
    | keystore_password            | [`ssl_keystore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-elasticsearch#plugins-outputs-elasticsearch-ssl_keystore_password)             |
    | ssl                          | [`ssl_enabled`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-elasticsearch#plugins-outputs-elasticsearch-ssl_enabled)                                 |
    | ssl_certificate_verification | [`ssl_verification_mode`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-elasticsearch#plugins-outputs-elasticsearch-ssl_verification_mode)             |
    | truststore                   | [`ssl_truststore_path`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-elasticsearch#plugins-outputs-elasticsearch-ssl_truststore_path)                 |
    | truststore_password          | [`ssl_truststore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-elasticsearch#plugins-outputs-elasticsearch-ssl_truststore_password)         |
  </dropdown>

  <dropdown title="logstash-output-http">
    | Setting             | Replaced by                                                                                                                                                                   |
    |---------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | cacert              | [`ssl_certificate_authorities`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-http#plugins-outputs-http-ssl_certificate_authorities) |
    | client_cert         | [`ssl_certificate`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-http#plugins-outputs-http-ssl_certificate)                         |
    | client_key          | [`ssl_key`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-http#plugins-outputs-http-ssl_key)                                         |
    | keystore            | [`ssl_keystore_path`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-http#plugins-outputs-http-ssl_keystore_path)                     |
    | keystore_password   | [`ssl_keystore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-http#plugins-outputs-http-ssl_keystore_password)             |
    | keystore_type       | [`ssl_keystore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-http#plugins-outputs-http-ssl_keystore_password)             |
    | truststore          | [`ssl_truststore_path`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-http#plugins-outputs-http-ssl_truststore_path)                 |
    | truststore_password | [`ssl_truststore_password`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-http#plugins-outputs-http-ssl_truststore_password)         |
    | truststore_type     | [`ssl_truststore_type`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-http#plugins-outputs-http-ssl_truststore_type)                 |
  </dropdown>

  <dropdown title="logstash-output-tcp">
    | Setting    | Replaced by                                                                                                                                                                                                                                                                                                                                                                   |
    |------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
    | ssl_cacert | [`ssl_certificate_authorities`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-tcp#plugins-outputs-tcp-ssl_certificate_authorities)                                                                                                                                                                                                   |
    | ssl_cert   | [`ssl_certificate`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-tcp#plugins-outputs-tcp-ssl_certificate)                                                                                                                                                                                                                           |
    | ssl_enable | [`ssl_enabled`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-tcp#plugins-outputs-tcp-ssl_enabled)                                                                                                                                                                                                                                   |
    | ssl_verify | [`ssl_client_authentication`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-tcp#plugins-outputs-tcp-ssl_client_authentication) in `server` mode and [`ssl_verification_mode`](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/lsr/plugins-outputs-tcp#plugins-outputs-tcp-ssl_verification_mode) in `client` mode |
  </dropdown>
</dropdown>

<dropdown title="Pipeline buffer type defaults to `heap`">
  We've improved memory configuration for certain Logstash plugins.
  Input plugins such as `elastic_agent`, `beats`, `tcp`, and `http` allocate buffers in Java memory to read events from the network.
  The default allocation method is `direct` memory rather than `heap` memory to simplify configuration, and to help facilitate debugging memory usage problems through the analysis of heap dumps.
  If you need to re-enable the previous behavior, change the `pipeline.buffer.type` setting in [logstash.yml](https://www.elastic.co/elastic/docs-builder/docs/2659/reference/logstash/logstash-settings-file).
  Check out [off-heap-buffers-allocation](/elastic/docs-builder/docs/2659/reference/logstash/jvm-settings#off-heap-buffers-allocation) for details. [#16500](https://github.com/elastic/logstash/pull/16500)
</dropdown>

<dropdown title="Logstash modules removed">
  We have removed the Logstash modules framework, and encourage users to try Elastic Integrations
  This includes the netflow, azure and arcsight modules, and the modules framework as a whole. [#16794](https://github.com/elastic/logstash/pull/16794)
</dropdown>

<dropdown title="Deprecated configuration settings removed">
  We have removed support for previously deprecated configuration settings:
  - **`http.*` prefixed settings for the Logstash API.** Settings prefixed by `http.*` have been replaced by the equivalent settings prefixed with `api.*`. [#16552](https://github.com/elastic/logstash/pull/16552)
  - **`event_api.tags.illegal`**
    Any events that include field named tags automatically rename the field _tags to avoid any clash
    with the reserved Logstash tags field.
    Instead, Logstash generates `_tagsparsefailure` in the event `tags` and the illegal value is written to the `_tags` field. [#16461](https://github.com/elastic/logstash/pull/16461)
</dropdown>

<dropdown title="Ingest converter removed">
  The ingest converter, which was used to convert ingest pipelines to Logstash pipelines, has been removed. [#16453](https://github.com/elastic/logstash/pull/16453)The `logstash-filter-elastic_integration` plugin offers similar functionality, and can help you use [Logstash to extend Elastic integrations](https://www.elastic.co/elastic/docs-builder/docs/2659/reference/logstash/using-logstash-with-elastic-integrations).
</dropdown>

<dropdown title="JDK11 not supported">
  JDK17 is the minimum version of the JDK required to run Logstash.
  For the best experience, we still recommend running Logstash using the bundled-jdk.
  See [Logstash JVM requirements](/elastic/docs-builder/docs/2659/reference/logstash/getting-started-with-logstash#ls-jvm)
  for details. [#16443](https://github.com/elastic/logstash/pull/16443)
</dropdown>

<dropdown title="Docker base image now UBI9 based">
  The base image for Logstash on Docker has been changed from Ubuntu to UBI9.
  If you create a Docker image based on the Logstash image and rely on it being Ubuntu based, you need to change your derived image to take account of this change.
  For example, if your derived docker image installs additional packages using a package manager, UBI9 uses `microdnf`, rather than `apt`.
  [#16599](https://github.com/elastic/logstash/pull/16599)
</dropdown>

<dropdown title="Cannot run Logstash as `superuser` by default">
  We've changed the default behavior to prevent users from accidentally running Logstash as a superuser.
  If you try to run Logstash as a superuser, it logs an error and fails to start, ensuring that users cannot run Logstash with elevated privileges by accident.You can change the value of the `allow_superuser` setting to `true` in [logstash.yml](https://www.elastic.co/elastic/docs-builder/docs/2659/reference/logstash/logstash-settings-file) if you want to restore the previous behavior and allow Logstash to run with superuser privileges. [#16558](https://github.com/elastic/logstash/pull/16558)
</dropdown>

<dropdown title="New setting required to continue using legacy internal monitoring">
  To continue using deprecated internal collection to monitor Logstash, set `xpack.monitoring.allow_legacy_collection` to `true` in [logstash.yml](https://www.elastic.co/elastic/docs-builder/docs/2659/reference/logstash/logstash-settings-file).
  We encourage you to move to [agent-driven monitoring](https://www.elastic.co/elastic/docs-builder/docs/2659/reference/logstash/monitoring-logstash-with-elastic-agent), the latest, supported way to monitor Logstash [#16586](https://github.com/elastic/logstash/pull/16586)
</dropdown>

<dropdown title="Avoiding JSON log lines collision">
  We've improved the way we deal with duplicate `message` fields in `json` documents.
  Some code paths that log in `json` produce log events that include multiple instances of the  `message` field. (The JSON codec plugin is one example.)
  While this approach produces JSON that is technically valid, many clients do not parse this data correctly, and either crash or discard one of the fields.We recently introduced the option to fix duplicates, and made it the default behavior for `9.0` and later.
  To re-enable the previous behavior, change the `log.format.json.fix_duplicate_message_fields` setting in [logstash.yml](https://www.elastic.co/elastic/docs-builder/docs/2659/reference/logstash/logstash-settings-file) to `false`.Check out [Logging in json format can write duplicate message fields](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/troubleshoot/ingest/logstash) for more details about the issue. [#16578](https://github.com/elastic/logstash/pull/16578)
</dropdown>

<dropdown title="Enterprise_search integration plugin is removed from default Logstash install">
  We’ve removed the Logstash Enterprise_search integration plugin, and its component App Search and Workplace Search plugins from the default Logstash install.
  These plugins will receive only security updates and critical fixes moving forward.We recommend using our native Elasticsearch tools for your Search use cases. For more details, please visit the [Search solution and use case documentation](https://docs-v3-preview.elastic.dev/elastic/docs-builder/docs/2659/solutions/search).
</dropdown>