code: @SuppressWarnings("unchecked")
    public Query linksToEntryId(String entryId) {
      checkNotEmpty(entryId, "entryId must not be empty.");
  
      params.put(PARAMETER_LINKS_TO_ENTRY, entryId);
  
      return (Query) this;
    }
docs: Request entries that link to given entryId.
  
  @param  entryId to be used.
  @return the calling query for chaining.
  @throws NullPointerException     if entryId is null.
  @throws IllegalArgumentException if entryId is empty.