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public class CustomObject {
  private String name;
  private String value;

  // Constructor
  // ...........................................

  // Getters & Setters
  // ...........................................
}

@IndexType(name = "myIndex")
public class MyObjectIndex extends Index {
  private static Finder<MyObjectIndex> find = ...................;
  private String id;
  private List<MyObject> myObjectList;

  // Getters & Setters
  // ..................................................

  @Override
  public Map toIndex(){
    Map<String, Object> map = new HashMap<>();
    map.put("id", id);

    // Is there a better way to convert my object list?
    List<Map<String, String>> convertedObjectList = new ArrayList<>();
    for(MyObject myObject : myObjectList){
      Map<String, String> convertedObject = new HashMap<>();
      convertedObject.put("name", myObject.getName());
      convertedObject.put("value", myObject.getValue());
      convertedObjectList.add(convertedObject);
    }

    map.put("myObjectList", convertedObjectList);

    return map;
  }
}