Thank you so much for your response.
My email address has been configured in elasticsearch.yml
I have already configured several other watches that are successfully returning log payload info as email alerts.
I was concerned about the role of the "email_admin" tag. But it looks like it has nothing to do with access permissions, etc. Like I guessed, if my email address is configured in elasticsearch.yml, I should be able to receive reports through email. Thank you once again for confirming this point.
However, I would like to bring to your notice that I see an error saying "sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target" when I tried simulating the watch.
I did not want to pose this question earlier because I really wasn't sure whether this was the only factor responsible for failure. But now I think I am pretty sure.
This obviously means that Kibana's self signed certificate is not being recognized by Watcher, right? And in order to resolve this and achieve generation of automated reports, I am supposed to ensure that justified certificate authorities are in place. Am I correct? I came to this conclusion after referring to the last couple of comments at https://github.com/elastic/kibana/issues/9783