code: Observable<ComapiResult<List<Participant>>> doGetParticipants(@NonNull final String token, @NonNull final String conversationId) {
          return wrapObservable(service.getParticipants(AuthManager.addAuthPrefix(token), apiSpaceId, conversationId).map(mapToComapiResult()), log, "Getting participants for " + conversationId);
      }
docs: Returns observable to add a participant to.
  
  @param token          Comapi access token.
  @param conversationId ID of a conversation to add a participant to.
  @return Observable to get a list of conversation participants.