72 lines
1.5 KiB
Plaintext
72 lines
1.5 KiB
Plaintext
[[mapping-fields]]
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== Meta-Fields
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Each document has metadata associated with it, such as the `_index`, mapping
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<<mapping-type-field,`_type`>>, and `_id` meta-fields. The behaviour of some of these meta-fields
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can be customised when a mapping type is created.
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[float]
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=== Identity meta-fields
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[horizontal]
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<<mapping-index-field,`_index`>>::
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The index to which the document belongs.
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<<mapping-type-field,`_type`>>::
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The document's <<mapping-type,mapping type>>.
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<<mapping-id-field,`_id`>>::
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The document's ID.
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[float]
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=== Document source meta-fields
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<<mapping-source-field,`_source`>>::
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The original JSON representing the body of the document.
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{plugins}/mapper-size.html[`_size`]::
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The size of the `_source` field in bytes, provided by the
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{plugins}/mapper-size.html[`mapper-size` plugin].
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[float]
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=== Indexing meta-fields
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<<mapping-field-names-field,`_field_names`>>::
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All fields in the document which contain non-null values.
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[float]
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=== Routing meta-field
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<<mapping-routing-field,`_routing`>>::
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A custom routing value which routes a document to a particular shard.
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[float]
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=== Other meta-field
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<<mapping-meta-field,`_meta`>>::
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Application specific metadata.
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include::fields/field-names-field.asciidoc[]
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include::fields/id-field.asciidoc[]
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include::fields/index-field.asciidoc[]
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include::fields/meta-field.asciidoc[]
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include::fields/routing-field.asciidoc[]
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include::fields/source-field.asciidoc[]
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include::fields/type-field.asciidoc[]
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