OpenSearch/docs/reference/query-dsl/queries/indices-query.asciidoc

[[query-dsl-indices-query]]
=== Indices Query

The `indices` query can be used when executed across multiple indices,
allowing to have a query that executes only when executed on an index
that matches a specific list of indices, and another query that executes
when it is executed on an index that does not match the listed indices.

[source,js]
--------------------------------------------------
{
    "indices" : {
        "indices" : ["index1", "index2"],
        "query" : {
            "term" : { "tag" : "wow" }
        },
        "no_match_query" : {
            "term" : { "tag" : "kow" }
        }
    }
}
--------------------------------------------------

You can use the `index` field to provide a single index.

`no_match_query` can also have "string" value of `none` (to match no
documents), and `all` (to match all). Defaults to `all`.

`query` is mandatory. You must provide the indices.
It is forbidden to omit or to give `indices` or `index` multiple times,
or to give both.

Please note that the fields order is important: If the indices are
provided before `query` or `no_match_query`, the query parsing is
skipped altogether.
For instance, this feature is useful to prevent a query that runs
against multiple indices to fail because of a missing type.
See `has_child`, `has_parent`, `top_children` and `nested`.