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[Docs] Warn about searching across all fields wt. `query_string` (#35570) 

Warn about potential performance impact when a large number of fields
is used with query string query and no default field.
This commit is contained in:
Peter Dyson 2018-11-19 22:21:59 +10:00 committed by Christoph Büscher
parent fda59ff969
commit 6d8af9731d
1 changed files with 5 additions and 2 deletions
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7
docs/reference/query-dsl/query-string-query.asciidoc
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@ -144,8 +144,11 @@ When not explicitly specifying the field to search on in the query
string syntax, the `index.query.default_field` will be used to derive string syntax, the `index.query.default_field` will be used to derive
which field to search on. If the `index.query.default_field` is not specified, which field to search on. If the `index.query.default_field` is not specified,
the `query_string` will automatically attempt to determine the existing fields in the index's the `query_string` will automatically attempt to determine the existing fields in the index's
mapping that are queryable, and perform the search on those fields. Note that this will not mapping that are queryable, and perform the search on those fields.
include nested documents, use a nested query to search those documents. This will not include nested documents, use a nested query to search those documents.
NOTE: For mappings with a large number of fields, searching across all queryable
fields in the mapping could be expensive.
[float] [float]
==== Multi Field ==== Multi Field