[8.x] Reapply "synthetic source index setting provider should check source field mapper" #113828
+360
−15
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Backporting #113759 to 8.x branch.
Originally added via #113522, but then reverted via #113745, because of mixed cluster test failures (#113730).
This PR is a clean revert of the commit the reverted #113522 and one additional commit that should address the build failures report in #113730 : c7bd242
Basically create index invocation that would fail anyway should be ignored. If mapper service creation now fails, then we just assume that there is no synthetic source usage. This is ok, because the index creation would fail anyway later one.
Closes #113730