title: ElasticSearch Filtered aliases with multiple terms
body: <p>I was refering to the document 
  <a href="https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-aliases.html#filtered" rel="nofollow noreferrer">https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-aliases.html#filtered</a>
  According to this we can have a filtered alias as follows </p>
  
  <pre><code>POST /_aliases
  {
      "actions" : [
          {
              "add" : {
                   "index" : "test1",
                   "alias" : "alias2",
                   "filter" : { "term" : { "user" : "kimchy" } }
              }
          }
      ]
  }
  </code></pre>
  
  <p>I have a requirement where in I want to use alias to group documents of multiple users,
  will it be a good idea if we create alias with multiple filter terms as follows .</p>
  
  <pre><code>POST /_aliases
  {
      "actions" : [
          {
              "add" : {
                   "index" : "test1",
                   "alias" : "alias2",
                   "filter" : { "terms" : { "user" : ["kimchy","testuser1","testuser2" ]} }
              }
          }
      ]
  }
  </code></pre>
  
  <p>Also can I use the operations like count,delete_by_query,update_by_query on such aliases ?
  Are there any limitations for such aliases<br>
  Regards,</p>