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[Docs] Add migration note about expanded fields limit (#34920) 

Adds a note to warn users about the limit introduced in #26541.
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Christoph Büscher 2018-10-29 10:23:07 +01:00 committed by GitHub
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docs/reference/migration/migrate_7_0/search.asciidoc
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@ -106,6 +106,14 @@ To safeguard against this, the maximum length of regex that can be used in a
Regexp Query request has been limited to 1000. This default maximum can be changed
for a particular index with the index setting `index.max_regex_length`.
[float]
==== Limiting the number of auto-expanded fields
Executing queries that use automatic expansion of fields (e.g. `query_string`, `simple_query_string`
or `multi_match`) can have performance issues for indices with a large numbers of fields.
To safeguard against this, a hard limit of 1024 fields has been introduced for queries
using the "all fields" mode ("default_field": "*") or other fieldname expansions (e.g. "foo*").
[float]
==== Invalid `_search` request body