Search in mail is presently badly broken, not returning most results, anything older than a couple of weeks is not found.

I have sent message to support@zohomail.com but did not get any autoresponse or anything so don't know if the ticket has been received, or not.  

Redacted screenshots showing emails i folder, and not able to find in search, this is not limited to just those emails, all emails are affected, all searches. 

Seems like your search index is majorly messed up.