[8.x] Don't skip shards in coord rewrite if timestamp is an alias (#117271) #117912
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…astic#117271) The coordinator rewrite has logic to skip indices if the provided date range filter is not within the min and max range of all of its shards. This mechanism is enabled for event.ingested and @timestamp fields, against searchable snapshots. We have basic checks that such fields need to be of date field type, yet if they are defined as alias of a date field, their range will be empty, which indicates that the shards are empty, and the coord rewrite logic resolves the alias and ends up skipping shards that may have matching docs. This commit adds an explicit check that declares the range UNKNOWN instead of EMPTY in these circumstances. The same check is also performed in the coord rewrite logic, so that shards are no longer skipped by mistake.
javanna
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Backports the following commits to 8.x: