a warning of type 'error' while in the json snippet below we see `"success": 1`

Question

On our wikibase server we see a cryptic message, a warning of type 'error' while in the json snippet below we see "success": 1

Warning: {"type":"error","message":"cirrussearch-backend-error","params":[]} [Called from Wikibase\Search\Elastic\EntitySearchElastic::getRankedSearchResults in /var/www/html/extensions/WikibaseCirrusSearch/src/EntitySearchElastic.php at line 318] in /var/www/html/includes/debug/MWDebug.php on line 333

{
    "searchinfo": {
        "search": "abc"
    },
    "search": [],
    "success": 1
}

http://api.kunstmuseum.nl/w/api.php?action=wbsearchentities&search=abc&language=en

Answer 1

The CirrusSearch README mentioned some steps that seem to have helped:

Now run this script to generate your elasticsearch index:
 php $MW_INSTALL_PATH/extensions/CirrusSearch/maintenance/UpdateSearchIndexConfig.php
Now remove $wgDisableSearchUpdate = true from LocalSettings.php.  Updates should start heading to Elasticsearch.
Next bootstrap the search index by running:
 php $MW_INSTALL_PATH/extensions/CirrusSearch/maintenance/ForceSearchIndex.php --skipLinks --indexOnSkip
 php $MW_INSTALL_PATH/extensions/CirrusSearch/maintenance/ForceSearchIndex.php --skipParse
Note that this can take some time.  For large wikis read "Bootstrapping large wikis" below.