[ENHANCEMENT] Highlighting Exact Matches

[LKing12]

Is your feature request related to a problem? Please describe.

If you need to perform an exact match search on an index, Marqo doesn't support highlighting

Describe the solution you'd like
when we do text:("free") we should get something like "Customers get <em>free</em> samples"

Describe alternatives you've considered

This should be an internal feature, a user could perform the highlighting on the returned result but that isn't optimal behaviour as it already exists in Vespa

Additional context

This seems to be supported in Vespa under bolding

[Tom]

Thanks Liam - this will be added in 2.6 with hybrid search. @pandu-k @farshidz can you confirm that we will support functionality that achieves this?

[Farshid Zavareh]

@tomhamer @LKing12 this will be part of a future release, but it may not be part of hybrid search (2.7) I'm afraid.