53462f6499
* Make fields optional in multi_match query and rely on index.query.default_field by default This commit adds the ability to send `multi_match` query without providing any `fields`. When no fields are provided the `multi_match` query will use the fields defined in the index setting `index.query.default_field` (which in turns defaults to `*`). The same behavior is already implemented in `query_string` and `simple_query_string` so this change just applies the heuristic to `multi_match` queries. Relying on `index.query.default_field` rather than `*` is safer for big mappings that break the 1024 field expansion limit added in 7.0 for all text queries. For these kind of mappings the admin can change the `index.query.default_field` in order to make sure that exploratory queries using `multi_match`, `query_string` or `simple_query_string` do not throw an exception. |
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