Here some hints how to query elasticSearch from your web browser
First of all ElasticSearch has an excellent web site with a lot of documentation:
https://www.elastic.co/guide/en/elasticsearch/guide/current/index.html
To inspect your indexes following functions are very helpfull:
with "_search" you can search for specific index types. e.g. "workflow" index types:
http://172.17.2.91:9200/workflow/_search
with "?pretty" the content will be displaied in a structured way
http://172.17.2.91:9200/workflow/_search?pretty
if you wnat to see more than 10 objects ausgegeben use the option "size". "Size" defines the amount of ibjects to display e.g. 100
http://172.17.2.91:9200/workflow/_search?pretty&size=100
IF you wnat to filter the objects you can use the function "&q=" e.g. filter attribute "status" for content "11":
http://172.17.2.91:9200/workflow/_search?pretty&size=100&q=status:11
If there are spaces in the filter expression use brackets:
http://172.17.2.91:9200/workflow/_search?pretty&size=100&q=status:(NOT DENIED)