After upgrading from 3.2.0 to 3.7.0 I get the following warning on Status Report.
Solr Server solr_backend
Schema incomplete
There are some language-specific field types missing in schema of Solr server Solr: en.
- I did update the config by downloading a new config.zip from /admin/config/search/search-api/server/[solr-server-name]
I've noticed the new config didn't contain accents_en.txt, protwords_en.txt, stopwords_en.txt and synonyms_en.txt, but rather a *_und.txt version of the previously mentioned files.
The site _could_ be incorrectly configured, since our agency inherited it, but I also noticed this → comment that seems to match mine (on 3.7, similar warning).
Any help would be appreciated, if any more information is needed, please ask.
Fixed
3.7
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.