Alerts using Kibana in AWS managed Elasticsearch

How can we enable alert from Kibana to Zenoss in AWS managed Elasticsearch

If you say AWS managed Elasticsearch do you talk about Elastic Cloud on AWS?
http://cloud.elastic.co/

No am referring to AWS managed Elasticsearch which is managed by AWS .
We are looking for generating alerts via Kibana or Elasticsearch without using Logstash.

In this case we can't help you here. As you said this is managed by AWS, so you need to use the AWS support.
However I would recommend considering using the official Elastic Cloud offering. This is also based on AWS and has in build the alerting capabilities starting with the Gold license level.