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a91b3fcbb9
This move the `murmur3` field to the `mapper-murmur3` plugin and fixes its defaults so that values will not be indexed by default, as the only purpose of this field is to speed up `cardinality` aggregations on high-cardinality string fields, which only requires doc values. I also removed the `rehash` option from the `cardinality` aggregation as it doesn't bring much value (rehashing is cheap) and allowed to remove the coupling between the `cardinality` aggregation and the `murmur3` field. Close #12874
24 lines
586 B
Plaintext
24 lines
586 B
Plaintext
[[mapper]]
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== Mapper Plugins
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Mapper plugins allow new field datatypes to be added to Elasticsearch.
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[float]
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=== Core mapper plugins
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The core mapper plugins are:
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<<mapper-size>>::
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The mapper-size plugin provides the `_size` meta field which, when enabled,
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indexes the size in bytes of the original
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{ref}/mapping-source-field.html[`_source`] field.
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<<mapper-murmur3>>::
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The mapper-murmur3 plugin allows hashes to be computed at index-time and stored
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in the index for later use with the `cardinality` aggregation.
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include::mapper-size.asciidoc[]
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include::mapper-murmur3.asciidoc[]
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