After enabling Elasticsearch6+ as Catalog Search engine in Magento admin (M2.3.3) I'm receiving this error while reindexing:

Catalog Search indexer process unknown error: null

3 Answers 3


This was caused by the fact that I had not set a prefix for Elasticsearch in the magento admin configurations.

After setting magento2 as the value for the prefix the indexing started working.


Run below command

$ curl -XPUT -H "Content-Type: application/json" http://localhost:9200/_all/_settings -d '{"index.blocks.read_only_allow_delete": null}'

and then run

$ php bin/magento indexer:reindex

=> paste this code

<VirtualHost *:8080>
ProxyPass "/" "http://localhost:9200/"
ProxyPassReverse "/" "http://localhost:9200/"

sudo a2ensite elasticsearch.conf

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