Meta-Fieldsedit

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-fieldsedit

_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-fieldsedit

_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-fieldsedit

_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-fieldsedit

_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-fieldedit

_meta
Application specific metadata.

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