Only disable unlicensed pattern_text templating when mapper is used #135561
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Currently we always set the
index.mapping.pattern_text.disable_templating
setting for every standard-mode index.This is a bit excessive, so this PR updates the logic to only include the setting if pattern_text field mappers are in use.
Instantiating a whole mapper service just to check for the existence of a PatternedTextMapper would be fairly expensive. So instead this patch simply checks the mapping source for the string "pattern_text". While there may be some false positives, the only overhead of a false positive is that a single index setting is set and then ignored.
This is an alternate approach to #135553