title: Searchkick - Elasticsearch - Names with underscore instead of white space
body: <p>we have tags example:</p>
  
  <pre><code>hello_my_name_is
  
  Tag.search "hello"
  =&gt; []
  </code></pre>
  
  <p>But when trying to search for <code>hello</code> with searchkick/elasticsearch we dont get anything in the results. We explicitly need to search for <code>hello_my_name_is</code> in order to get it.</p>
  
  <pre><code>Tag.search "hello_my_name_is"
  =&gt; [{name: "hello_my_name_is"...}]
  </code></pre>
  
  <p>Is there some way to get around this issue? </p>