Plus symbol "+" doesn't work in query_string. Only AND word

OpenSearch
1

I tried to use “+” in the query_string and it doesn’t work. Is it a bug or am I doing something wrong?

2

Please check [1], [2] for valid syntax

[1] Query string queries - OpenSearch documentation
[2] Query string query | Elasticsearch Guide [8.7] | Elastic

3

It should work, can you share an example?