Best way to contains search in elastic search

Elastic Stack Elasticsearch
1

Hi,
I am working on a use case which does contains search in logs data indexed in elastic server. the query is a case-insensitive one

I am aware of match, match_phrase and query string. But none of the seems to be working for my use case.

can any one suggest how to contains search in Elasticsearch.

2

Have you looked at using the wildcard field type which as far as I can tell could be a good fit?

3

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