Elasticsearch breaking changes

Before you upgrade, carefully review the Elasticsearch breaking changes and take the necessary steps to mitigate any issues.

To learn how to upgrade, check out <uprade docs>.

Release date: March 25, 2025

Allocation

• Increase minimum threshold in shard balancer #115831
• Remove cluster.routing.allocation.disk.watermark.enable_for_single_data_node setting #114207
• Remove cluster state from /_cluster/reroute response #114231 (issue: #88978)

Analysis

• Snowball stemmers have been upgraded #114146
• The german2 stemmer is now an alias for the german snowball stemmer #113614
• The persian analyzer has stemmer by default #113482 (issue: #113050)
• The Korean dictionary for Nori has been updated #114124

Cluster Coordination

• Remove unsupported legacy value for discovery.type #112903

Highlighting

• Remove support for deprecated force_source highlighting parameter #116943

Indices APIs

• Apply more strict parsing of actions in bulk API #115923
• Remove deprecated local attribute from alias APIs #115393

Infra/REST API

• Output a consistent format when generating error json #90529 (issue: #89387)

Ingest Node

• Remove ecs option on user_agent processor #116077
• Remove ignored fallback option on GeoIP processor #116112

Mapping

• Remove support for type, fields, copy_to and boost in metadata field definition #116944

Search

• Remove legacy params from range query #116970

Snapshot/Restore

• Remove deprecated xpack.searchable.snapshot.allocate_on_rolling_restart setting #114202