code: public CMAArray<CMAApiKey> fetchAll(String spaceId, Map<String, String> query) {
      assertNotNull(spaceId, "spaceId");
  
      return service.fetchAll(spaceId, query).blockingFirst();
    }
docs: Query for specific api keys, overriding the configuration set.
  <p>
  This method will override the configuration specified through
  {@link CMAClient.Builder#setSpaceId(String)} and will ignore
  {@link CMAClient.Builder#setEnvironmentId(String)}.
  
  @param spaceId the id of the space to host the api keys.
  @param query   the terms to query for specific keys.
  @return a list of delivery api keys.
  @throws IllegalArgumentException if spaceId is null.