Overriding index setting configuration bug

[tung-huynh]

Hi guys,

It seems we got a bug at overriding the index settings configuration.
Here is how we can reproduce the issue.

Elasticsearch settings:

Document annotation:

Actually result:

Expected result:
{ "mappings": { "_doc": { "properties": [] } }, "settings": { "number_of_replicas":0, "number_of_shards": 5 } }

I believe this line which caused the bug, you can see the issue easily here

- PHP version: 7.3
- Elasticsearch version: 6.6.1
- Bundle version: 6.x
- Symfony version: 5.x