Thanks for the reply.
You may want to define that term.
I mean the various fulltext query options over the "content" field in my example.
The point is that I want to be able to a query over an unanalyzed string field "tag", get my results and get my labels highlighted in the contents of the "content" field without a separate index query, i.e. I want to highlight only the contents of the documents found by the query over the "tag" field.
There isn't an api that just highlights stuff like the analyze api just analyes stuff.
I take this to mean that I can't highlight a specific document/set of documents, current APIs only work in combination with a query. Is that correct?