Highlight doesn't work with Arabic

I don't know any Arabic, and only very little about it, so I'm not sure what the problem here could be. It just seems from a quick search that this isn't an uncommon problem, and unfortunately none of the links I viewed there contained a solution.
I guess you could try to post your question on StackOverflow or in the Solr mailing list, provide as much details as you can, and hope someone more knowledgable comes along and is able to help you. Maybe you'll have to adapt Solr's schema.xml to work properly with Arabic.
The only thing I can tell you is that you should disable the "Highlighting" processor on the index's "Filters" tab, since that doesn't work properly in conjunction with Solr. Or, maybe try to disable "Highlight retrieved data" in the server's settings and instead enabled said processor – maybe the Search API processor will work better with Arabic than Solr's internal one? In any case, always only use one of the two.

PS: It seems you (like many others – it's really easy to misinterpret) are confused by the "Issue tags" field. As the guidelines state, they aren't meant for free text tags related to the issue, but only for specific categorization purposes, usually by module maintainers.
So, if you aren't sure your current usage is correct, please just leave the field empty. (In your case, "arabic" seems to be used in several other issues as well, so it might make sense to leave it.)

Hi Memoday,
This module is working fine . For this you need to do proper setting of your Search Index. So, make changes as
# Edit you Search Index "config/search/search_api/index/your_search_index_name/edit".
# Click on Filter tab.
#Tick " Highlighting " in the listing.
#Then you will get "Processor settings " below where you can write css for the search text.
#save Configuration.
I implemented a search for Arabic test and its working fine.

Hope this will work for you. Otherwise there will be problem with "schema.xml" or Solr Configuration.

Thanks.

Hi Memoday,

I attach two screen shot "processor setting" and "search result". So you can add css accordingly.

I hope this would help you.

This is really a different problem than the original one and should be dealt with in a new issue – but since this is your issue and no-one else has reported with the same problem here, I guess we can make an exception in this case.

The first question is: in the Solr server settings (in Drupal), did you enable both "Retrieve result data from Solr" and "Highlight retrieved data" under "Advanced"?

If you did, and it still doesn't work, see the caveat in the handbook.

For Search API Pages, there's no built-in way for a different output format. If you want a table, your only option is to set its "View mode" to "Themed as search results" and then override the search-api-page-results.tpl.php and search-api-page-result.tpl.php templates in your site's theme. (It's also possible to only override it for a specific search page by appending the page's machine name.)

I'm afraid this is currently not configurable. We actually use [HIGHLIGHT]^[/HIGHLIGHT] as the tags in the Solr request and then manually transform these to <strong> tags to be able to sanitize the field's HTML. Adding an option for the tags to use instead of hard-coding <strong> wouldn't be too difficult, but just wasn't done yet, so currently changing this would be rather hack-y and require custom code of some way or other.

This issue was closed due to lack of activity over a long period of time. If the issue is still acute for you, feel free to reopen it and describe the current state.