[ML] Search on job tags fails if field value contains the @ character

[peteharverson]

A search on the anomaly detection job management page using the job_tags field inside custom_settings, as added in #102099, fails if the field value used in the search contains an @ character.

For example, a search such as job_tags:(euid:8014 or author:@randomuserid) fails to match the expected one job which contains that tag in the following search, and instead an unfiltered list is displayed:

Tested using a job which contains the following inside custom_settings:

    "job_tags": {
      "euid": "8015",
      "name": "many-usernames-from-a-source-ip",
      "event.category": "authentication",
      "maturity": "experimental",
      "author": "@randomuserid",
      "version": "1",
      "updated_date": "5/12/2021"
    }

[elasticmachine]

Pinging @elastic/ml-ui (:ml)

[jgowdyelastic]

This is a query parsing issue in the EuiSearchBar. Our onChange function only receives an error. This is not something we can fix in our code.
There was a problem where the parsing error was not being displayed which is fixed in #104759

[peteharverson]

Closing issue as a search can be done on a value containing the @ character, if the string is enclosed within double quotes - as made possible by elastic/eui#3432.

For example, the following correctly searches for jobs containing author:@randomuserid inside job_tags:

job_tags:("author:@randomuserid")

Or this more complex example using an or also works as expected

job_tags:(euid:8015 or "author:@randomuserid")