Replace some usages of QueryShardContext#getMapperService (#63239) #63485
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This is the backport of #63239
QueryShardContext has a getter that allows to have access to MapperService. In many cases, it is misused to lookup field types which QueryShardContext has a specific method for. This commit replaces those usages with a function String -> MappedFieldType.
There are also a few other places where MapperService is retrieved to call methods that are also available directly on QueryShardContext, which are replaced as part of this commit too.