User accountID for JQL queries after March 29, 2019 Edited

[Nadezhda Fedulkina]

Hello.

1. Tell, please, how to get user accountID for JQL queries after March 29, 2019.

Will Atlassian provide a JQL autocomplete user interface control for Jira in cloud?

2. Why is this possible? Only one task is displayed in the filter if the JQL-query specifies "comment ~" and then the accountID of user.

But when the filter is set to "comment ~" and the user name, the result is a lot of tasks.

3. What condition should I create to verify that a comment has a user mention if I know the accountID in Automation for Jira?

{{issue.comments.last.body}} contains ??? (what to insert?)

Help, please.

Thank you.

Nadejda.