elasticsearch/docs/reference/elasticsearch-plugins/mapper-plugins.md

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---
mapped_pages:
- https://www.elastic.co/guide/en/elasticsearch/plugins/current/mapper.html
---
# Mapper plugins [mapper]
Mapper plugins allow new field data types to be added to Elasticsearch.
## Core mapper plugins [_core_mapper_plugins]
The core mapper plugins are:
[Mapper size plugin](/reference/elasticsearch-plugins/mapper-size.md)
: The mapper-size plugin provides the `_size` metadata field which, when enabled, indexes the size in bytes of the original [`_source`](/reference/elasticsearch/mapping-reference/mapping-source-field.md) field.
[Mapper murmur3 plugin](/reference/elasticsearch-plugins/mapper-murmur3.md)
: The mapper-murmur3 plugin allows hashes to be computed at index-time and stored in the index for later use with the `cardinality` aggregation.
[Mapper annotated text plugin](/reference/elasticsearch-plugins/mapper-annotated-text.md)
: The annotated text plugin provides the ability to index text that is a combination of free-text and special markup that is typically used to identify items of interest such as people or organisations (see NER or Named Entity Recognition tools).