Describe the feature:

• In earlier versions (before v9.2.0 Kibana Discover field showing (empty) means the field exists in the document, while its value is empty. And the field showing - means the field itself doesn't exist in the document.
• But in later versions i.e. starting v9.2.0 it is changed to (blank) and (null) respectively. Please see the screenshots for reference.

• This enhancement PR 233369 was a deliberate choice made to align across multiple charts/visualization/tools the way we represent empty strings or null values. And also mentioned in the release notes here.

• But this change in the Discover View may create lot of confusion for many users as (empty) and - might be more relevant representation for them.

• Provide a way to configure these Kibana Discover View via the advanced settings (one for the entire kibana, not per tool) should be feasible here. so that users have liberty to choose the View as per their choice.