Add a FF for ES default_operator change

Merged Dmitry Gruzd requested to merge 233350-change-es-default-operator into master

What does this MR do?

This feature is behind the :elasticsearch_use_or_default_operator feature flag

Today our Advanced Search is defaulting our search queries to using "AND" as the default operator as part of the query syntax https://docs.gitlab.com/ee/user/search/advanced_search_syntax.html#using-the-advanced-syntax-search.

This MR switches that to "OR" for all scopes except code search, the change is behind the feature flag and disabled by default.

FF rollout issue: #246500

#233350 (closed)

Screenshots

Does this MR meet the acceptance criteria?

Conformity

Availability and Testing

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

  • Label as security and @ mention @gitlab-com/gl-security/appsec
  • The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
  • Security reports checked/validated by a reviewer from the AppSec team
Edited by Dmitry Gruzd