I can search for email in the “Any Email” field of the advanced search. Works fine. When I use the Global search I don’t find the email.
In Admin Search Settings - it was set to Basic and I changed to Basic + Advanced. Not using Elastic. I could not find in the documentation an explanation of what the Search Settings difference between Basic vs Basic + Advanced.
I suggest that you upgrade your SuiteCRM to the latest version…
You should also check if your Lucene job is running correctly from cron. See that in Admin / Schedulers, enter the job and check the “last ran successfully” field.