Morphia Quering is not working as expected. version 2.4

[SOCRATESZZ]

I have an Entity

@Entity("Book")
class Book{
   @Reference(language_id)
   private Language language;
}

@Entity("Language")
class Language{
   @Id
   public String id;
   // getters and setter
}

I am trying to query Books using language Id only

query.filter(Filters.eq("language.id", "1232342342 ==> the ID")).disableValidation().iterator().toList();

it is giving an error

dev.morphia.query.ValidationException: Could not resolve path 'language.id' against 'Book'.  Unknown path element: 'language'.

[evanchooly]

In your query, you'd simply reference the language field on your entity and pass the ID value. You can't "path" down through the referenced type as there are no joins in MongoDB queries.

[SOCRATESZZ]

Language get stored as DB reference. I Do not have Language Entity reference. I only have book entity reference, "language" and language Id.
Complete querying code

filterList = [ Filters.eq("language", "12313333--=>id") ];
Query<P> query = this.datastore.find(Book.class);
 for(Filter filter : filterList) {
      query.filter(filter);
   }

 return query.disableValidation().iterator().toList();

When i try to execute the query it automatically replaces the id with null from filter->value. Therefore nothing is returned.