Fix json validation for elasticsearch_aws_role_arn
What does this MR do and why?
This MR removes the JSON validation for regex on the elasticsearch_aws_role_arn application setting - it had a bug.. The validation now allows any string and null. I also added specs for validation
AI Summary
This change simplifies the validation rules for an AWS role setting in Elasticsearch configuration. Previously, the system had complex rules that only allowed specific formats (like AWS ARN patterns), but now it accepts any text string or empty/null values. The accompanying tests verify that the field now accepts various string inputs, empty values, and null values, while still rejecting non-string data types like numbers. This makes the configuration more flexible by removing strict formatting requirements.
References
- (internal report) https://gitlab.zendesk.com/agent/tickets/660391
Screenshots or screen recordings
| Before | After |
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How to set up and validate locally
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/milstone %18.5