Fix execution of exists query within nested queries on field with docvalues disabled #79462
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The FieldNamesFieldMapper adds non-indexed fields to a special metadata
field so that exists queries can be run efficiently. This is built in a postParse
method that is run once per document. However, this means that nested
documents are not handled correctly - non-indexed field names are added to
the parent document's metadata field rather than to the nested document's
field.
This commit fixes things to add non-indexed field names directly to the
nested documents.