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Meta-Fields

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Meta-Fields

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Each document has metadata associated with it, such as the _index, mapping _type, and _id meta-fields. The behaviour of some of these meta-fields can be customised when a mapping type is created.

Identity meta-fields

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`_index`	The index to which the document belongs.
`_uid`	A composite field consisting of the `_type` and the `_id`.
`_type`	The document’s mapping type.
`_id`	The document’s ID.

Document source meta-fields

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_source: The original JSON representing the body of the document.
_size: The size of the _source field in bytes, provided by the mapper-size plugin.

Indexing meta-fields

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_all: A catch-all field that indexes the values of all other fields.
_field_names: All fields in the document which contain non-null values.
_timestamp: A timestamp associated with the document, either specified manually or auto-generated.
_ttl: How long a document should live before it is automatically deleted.

Routing meta-fields

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_parent: Used to create a parent-child relationship between two mapping types.
_routing: A custom routing value which routes a document to a particular shard.

Other meta-field

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_meta: Application specific metadata.

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