[BUGFIX] Do not index translations on default language in languages free mode

[dkd-kaehm]

With fallbackType: free the index queue contains an entry for each available language. Without this check all the entries are additionally indexed in the default language. They should be only indexed for the language, the record has defined as sys_language_uid.

Fixes #3560
Ports: #3785

[ulrike-cosmoblonde]

Hi,

I am sorry but this fix in file /solr/Classes/IndexQueue/Indexer.php can not cope with records (e.g. tx_news) having sys_language_uid = -1 (= all languages)

If I remove the new lines 267-274 everything works as before:

 // skip translated records for default language within "free content mode"-languages
        if ($language === 0
            && isset($languageField)
            && (int)($itemRecord[$languageField] ?? null) !== $language
            && $this->isLanguageInAFreeContentMode($item, (int)($itemRecord[$languageField] ?? null))
        ) {
            return null;
        }

Could you please add an additional check to handle sys_language_uid = -1 and to keep indexing into all solr language cores as before?

Thank you!
Ulrike