title: Elasticsearch, how to get a search result in all circumstances
body: <p>I've been dealing with a project. My goal is to get result from search engine in all circumstances for example, although i enter a keyword which is not include the keys inside data or is a empty string, I still need to get some result.How can i reach my goal?</p>
  <p>you can see the query below :</p>
  <pre><code>  query: {
            regexp: {
              title: &quot;something to not found .*&quot;,
            },
  </code></pre>