what's the difference between ElasticSearch http ports in different nodes
<p>We know each ES node has 9200(default) http port for CRUD operation. And there are three types ES nodes: Master, Data and Client. 
So my question is that the same http port in different node type acting different roles or say they are little bit different? 
I have the question just because I saw different result when I query the http port in different node type sometimes. </p>

<p>It seems something very weird when I call Master's http port.Did you guys meet this situation please? Is that because some cache data? Thanks!</p>