Highlight excerpts in view results don't work with Arabic anymore.

Oh sorry, I meant to open this ticket in the Search API Solr module, I'll reopen this ticket in the correct module.

Just for completeness: dpm($item->getAllExtraData()); does not contain any highlighting information.
It contains one field but nothing related to highlighting:

$input array(1)
    →'search_api_solr_document' => Solarium\QueryType\Select\Result\Document(1)
            contents Iterator contents (10) Available methods (11) 
            →protected fields -> array(10)
                'id' => string(35) "21b00u-solr_search-entity:node/3:en"
                'index_id' => string(11) "solr_search"
                'hash' => string(6) "21b00u"
                'site' => string(24) "http://localhost:8000/en"
                'ss_search_api_id' => string(16) "entity:node/3:en"
                'ss_search_api_datasource' => string(11) "entity:node"
                'ss_search_api_language' => string(2) "en"
                '_version_' => integer1599160621253787648
                'timestamp' => string(24) "2018-04-30T08:53:31.994Z"
                'score' => float0.14160182

The thing is, I use the the highlights in the Solarium result object, to calculate other things as well and this still works, so Solr does its part, but they're incorrectly processed.
Thanks for your input though, I'll coin this to the Solr module.

Thanks for the response.

I just updated to version 8.x-2.0-rc1 using drush, but it fails when I clear my cache or try to uninstall.
Following are the steps I took, is there something forgot to do?

root@58238e63bba5:/var/www# drush dl --select search_api_solr
Choose one of the available releases for search_api_solr:
 [0]  :  Cancel                                                 
 [1]  :  8.x-2.0-rc1  -  2018-May-23  -  Supported              
 [2]  :  8.x-2.x-dev  -  2018-May-23  -  Development            
 [3]  :  8.x-1.x-dev  -  2017-Dec-06  -  Development            
 [4]  :  8.x-1.2      -  2017-Nov-01  -  Supported, Recommended
1
Install location /var/www//modules/contrib/search_api_solr already exists. Do you want to overwrite it? (y/n): y
Project search_api_solr (8.x-2.0-rc1) downloaded to                  [success]
/var/www//modules/contrib/search_api_solr.
Project search_api_solr contains 3 modules: search_api_solr_defaults, search_api_solr_devel, search_api_solr.

root@58238e63bba5:/var/www# drush en -y search_api_solr
search_api_solr is already enabled.                                  [ok]
There were no extensions that could be enabled.                      [ok]

root@58238e63bba5:/var/www# drush cr
PHP Fatal error:  Default value for parameters with a class type hint can only be NULL in /var/www/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php on line 2669

Fatal error: Default value for parameters with a class type hint can only be NULL in /var/www/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php on line 2669
Drush command terminated abnormally due to an unrecoverable error.   [error]
Error: Default value for parameters with a class type hint can only
be NULL in
/var/www/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php,
line 2669

root@58238e63bba5:/var/www# drush pmu search_api_solr
The following extensions will be uninstalled: search_api_solr
Do you really want to continue? (y/n): y
PHP Fatal error:  Default value for parameters with a class type hint can only be NULL in /var/www/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php on line 2669

Fatal error: Default value for parameters with a class type hint can only be NULL in /var/www/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php on line 2669
Drush command terminated abnormally due to an unrecoverable error.                                                                                                                                        [error]
Error: Default value for parameters with a class type hint can only be NULL in /var/www/modules/contrib/search_api_solr/src/Plugin/search_api/backend/SearchApiSolrBackend.php, line 2669

Ah, well, we're still working with PHP 5.6 unfortunately, and enforcing a PHP 7 upgrade just like that, isn't something I can do.

Nevertheless, not quite sure how this feature stopped working.
The multilingual feature seems like a great extension to use, but it wasn't necessary before.

The query still gets transported to Solr, Solr still processes it correctly and returns a correct result with the correct [HIGHLIGHT] tags.
So all of this still works like it did before the update, only problem is that in my view's excerpts now only English queries get a visual highlight.

If you need more information from me, I'm happy to provide it, but sadly I can't simply upgrade everything to the latest version.

Well I never had an issue with it, but the access rules for the view is set to None.

Which settings are these specifically?
What I did to make this work, was the following:
1. activating the highlight processor on the index

2. adding the Search: Excerpt field to the view.

This results in English being tagged, but Arabic results are left untouched.

I turned off the Highlights processor like you said, but those server settings were already enabled.
The only thing that happens now, is the correctly matched entities are shown, but the excerpts in my view no longer contain anything.
When picking pure field values in the view like so Content datasource: Source Text (indexed field),
these fields are just getting rendered in their entirety without any highlighting, which is not what I'm looking for.

Is there any additional information I can provide you to give insights in how my setup looks?

Alright, I'll poke around and see if I can intercept where it goes wrong.
Pretty sure it's just a simple encoding issue somewhere which got through :)
If I find anything, I'll let you know.

Also, just to be complete, I'm using Fields as format in the views, not rendered entities.