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Document that _index is a virtual field and only supports term queries 

Closes #15070
Closes #15081
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Clinton Gormley 2015-11-30 08:42:56 +01:00
parent 1685126bb6
commit 72be42d742
1 changed files with 11 additions and 4 deletions
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15
docs/reference/mapping/fields/index-field.asciidoc
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[[mapping-index-field]]
=== `_index` field
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. Its value is accessible in queries, aggregations, scripts, and when sorting:
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.
Its value is accessible in `term`, or `terms` queries, aggregations,
scripts, and when sorting:
NOTE: The `_index` is exposed as a virtual field -- it is not added to the
Lucene index as a real field. This means that you can use the `_index` field
in a `term` or `terms` query (or any query that is rewritten to a `term`
query, such as the `match`, `query_string` or `simple_query_string` query),
but it does not support `prefix`, `wildcard`, `regexp`, or `fuzzy` queries.
[source,js]
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