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.
This plugin can be installed using the plugin manager:
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.
This plugin can be downloaded for offline install from https://artifacts.elastic.co/downloads/elasticsearch-plugins/mapper-murmur3/mapper-murmur3-6.6.0.zip.
The plugin can be removed with the following command:
sudo bin/elasticsearch-plugin remove mapper-murmur3
The node must be stopped before removing the plugin.