Highlighting on a wildcard field name causes the wildcard expression to be returned rather than the actual field name

[javanna]

Wildcards expressions are supported to specify which fields need to be highlighted. When using a wildcard expression, in some cases the highlighted fragments generated by the fast vector highlighter contain the wildcard expression as field name instead of the actual field name.

This happens also with the other when returning errors like:

• "the field [field*] should be indexed with positions and offsets in the postings list to be used with postings highlighter"
• "the field [field*] should be indexed with term vector with position offsets to be used with fast vector highlighter"
• "source is forced for field [field*] but type [type1] has disabled _source"

In all the above cases, the actual field name should be returned (e.g. field1 rather than field*)

Relates to #5175 .