s.oracle.com/en/java/javase/17/docs/api/java.base/java/util/List.html" title="class or interface in java.util" class="external-link"><code>List</code></a>, or <a href="https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/Map.html" title="class or interface in java.util" class="external-link"><code>Map</code></a> field. However,
 complex sub-fields may not appear in composite indexes.

 <p>
 For those complex sub-fields that can contain duplicate values (namely, <a href="https://docs.oracle