[8.x] Update grammar to rely on indexPattern instead of identifier in join target #120784
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…target (elastic#120494) This replaces identifier with indexPattern in joinTarget grammar. This change is needed to make index selection consistent between FROM and [LOOKUP] JOIN commands: * Both should use the same quotes " (currently join relies on `) * Both should allow specifying indices with - without having to quote them (not possible with join at the moment) * Both should conform to allowed index names (there are number of differences today, for example it is possible to specify test? or +test in join even though it is not a valid index name.) (cherry picked from commit 9ffe3c8)
idegtiarenko added >enhancement backport Team:Analytics idegtiarenko added the auto-merge-without-approval 
luigidellaquila approved these changes Jan 24, 2025
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This backports following changes to 8.x branch: