Add precise logging on unknown or invalid settings #20951
Merged
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Today when logging an unknown or invalid setting, the log message does
not contain the source. This means that if we are archiving such a
setting, we do not specify where the setting is from (an index, and
which index, or a persistent or transient cluster setting). This commit
provides such logging for the end user can better understand the
consequences of the unknown or invalid setting.
Closes #20946