How can I search for specific user made changes or updated task recently?
updated >= -1w and changer = user1
updated >= -1w and updatedby = user1
As far as I know there is no such JQL functions available. But you can use historic search on some jira fields. Those fields are limited but maybe it will cover your case.
Have a look at the following article:
https://confluence.atlassian.com/jira064/advanced-searching-720416661.html (WAS, WAS IN, WAS NOT IN, WAS NOT, CHANGED).
If you want to solve the problem generally you can develop your own JQL function by developing a plugin or using Adaptivist ScriptRunner. But this JQL function can have low performance and you should use it carefully. If are interested in developing such a function I can give you more details.
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