Issue in Find users by query with email in User Search Rest API

Issue Summary

When performing a request to the Find users REST API endpoint https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-user-search#api-rest-api-3-user-search-get by inserting the email address on the query parameter erroneously, the response of the endpoint still returns the result.

This is because of the following logic: when an email address is recognized as invalid a possible user error/mistake is taken into account and therefore the email address is tokenized and the different tokens are used to try to match full name or display name fields. So, the result is returned in case one of the name fields matches one of the tokens, but this is not clearly documented.

Steps to Reproduce

1. Perform a request to the endpoint using an email with '123' at the end:

/rest/api/3/user/search?startAt=0&maxResults=50&query=something@email.com123  

Expected Results

Empty result

Actual Results

If one of the name fields matches or include 'something' the search will still return the information.

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available