Illegal Argument Error When Re-indexing

Question

I've ben having some trouble with my site since upgrading to Magento ver. 2.4.0.

My products don't appear in the category pages and when I try to reindex I get the following error message:

Catalog Search index process unknown error:

{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Types cannot be provided in put mapping requests, unless the include_type_name parameter is set to true."}],"type":"illegal_argument_exception","reason":"Types cannot be provided in put mapping requests, unless the include_type_name parameter is set to true."},"status":400}

From what I've seen through a little research this seems to be related to Elasticsearch so I ran the command: curl -XGET '<hostIP:port>/_cat/health?v&pretty'

And got the message:

epoch      timestamp cluster        status node.total node.data shards pri relo init unassign pending_tasks max_task_wait_time active_shards_percent
1606836115 15:21:55  docker-cluster yellow          1         1      2   2    0    0        2             0                  -                 50.0%

I've seen that this might be due to having the wrong version of Elasticsearch installed but I'm not sure how to upgrade/downgrade my version so any guidance on this would be appreciated.

Answer 1

Check which version of Elastic is selected in the admin panel

Stores -> Configuration -> Catalog -> Catalog -> Catalog Search -> Search Engine

I try to use Elasticsearch 7

Answer 2

I had the same problem. It falls back to elasticsearch6 but required elasticsearch7.

php bin/magento config:set  catalog/search/engine  elasticsearch7
php bin/magento cache:clean config
php bin/magento indexer:reindex