Kibana Query for String Pattern Match

Elastic Stack Kibana
1

In Kibana search what would be best practice to search for string patterns. My use case here is How would one go about searching in a large txt attribute. I have tried query patterns as myAttr1: attrVal1 AND sDetails: CustomStringPattern

Using a Pattern causes the Kibana UI to become unresponsive. Any other recommendations to run these string search queries.

2

Is the UI unresponsive or the backend?

3

Backend. I believe it timesout trying to do a * based pattern match.