﻿---
title: Mapper murmur3 plugin
description: The mapper-murmur3 plugin provides the ability to compute hash of field values at index-time and store them in the index. This can sometimes be helpful...
url: https://www.elastic.co/elastic/docs-builder/docs/2697/reference/elasticsearch/plugins/mapper-murmur3
products:
  - Elasticsearch
---

# Mapper murmur3 plugin
The mapper-murmur3 plugin provides the ability to compute hash of field values at index-time and store them in the index. This can sometimes be helpful when running cardinality aggregations on high-cardinality and large string fields.

## Installation

This plugin can be installed using the plugin manager:
```sh
sudo bin/elasticsearch-plugin install mapper-murmur3
```

The plugin must be installed on every node in the cluster, and each node must be restarted after installation.
You can download this plugin for [offline install](https://www.elastic.co/elastic/docs-builder/docs/2697/reference/elasticsearch/plugins/plugin-management-custom-url) from [[https://artifacts.elastic.co/downloads/elasticsearch-plugins/mapper-murmur3/mapper-murmur3-9.3.0.zip](https://artifacts.elastic.co/downloads/elasticsearch-plugins/mapper-murmur3/mapper-murmur3-9.3.0.zip)](https://artifacts.elastic.co/downloads/elasticsearch-plugins/mapper-murmur3/mapper-murmur3-9.3.0.zip). To verify the `.zip` file, use the [SHA hash](https://artifacts.elastic.co/downloads/elasticsearch-plugins/mapper-murmur3/mapper-murmur3-9.3.0.zip.sha512) or [ASC key](https://artifacts.elastic.co/downloads/elasticsearch-plugins/mapper-murmur3/mapper-murmur3-9.3.0.zip.asc).

## Removal

The plugin can be removed with the following command:
```sh
sudo bin/elasticsearch-plugin remove mapper-murmur3
```

The node must be stopped before removing the plugin.