As search.musicbrainz.org has been closed last week, the code used to keep the compatibility with it can be dropped.
That is all occurrences of search.musicbrainz.org (usually for SEARCH_SERVER), and all occurrences of SEARCH_ENGINE (as LUCENE is no longer applicable, SOLR would be the only accepted value).
- has related issue
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SEARCH-691 Drop web service compatibility
- Open
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MBS-12730 Redirect search requests from search-disabled mirrors to the main server
- Open