title: How to get users by custom attributes in keycloak?
body: <p>I know that there is admin APIs to get the list of users which returns the user representation array. </p>
  
  <pre><code>GET /admin/realms/{realm}/groups/{id}/members
  </code></pre>
  
  <p>returns </p>
  
  <pre><code>https://www.keycloak.org/docs-api/2.5/rest-api/index.html#_userrepresentation
  </code></pre>
  
  <p>but is there a way to get users by custom attribute ? </p>