> > I mean solr's Http caching. When testing from browser I usually disable it > with > in solrconfig.xml.
I have enabled <httpCaching never304="true">, changed the title field to be the same "text" type, cleared the index, restarted and re-indexed and - it works! I then changed the title field back to the "text" type, cleared and re-indexed and the highlighting was gone. The conclusion: the type mismatch between the query you're searching on and the field that you want to use as a highlighting source can cause issues, if different. Should that be fixed or just noted down?