elasticsearch/docs/reference/mapping/fields/index-field.asciidoc
Ryan Ernst 1c99626b84 Mappings: Remove ability to configure _index
The `_index` field is now a completely virtual field thanks
to #12027. It is no longer necessary to index the actual value
of the index name.

closes #12329
2015-07-20 23:54:35 -07:00

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[[mapping-index-field]]
=== `_index`
When performing queries across multiple indexes, it is sometimes desirable
to add query clauses that are associated with documents of only certain
indexes. The `_index` field allows matching on the index a document was
indexed into.