how to use Dspace 7 highlight title when search result?

[Thanapoj SA]

Hello guys,

I want show Title highlighting is not work when search result.

It a same below image example.

I read about https://wiki.lyrasis.org/display/DSDOC7x/Discovery

and use discocory.xml default of dspace 7.

But title highlighting is not work when search result,

do you have any idea for working?

Thank you very much.