code: Observable<ComapiResult<Void>> doDeleteConversation(@NonNull final String token, @NonNull final String conversationId, final String eTag) {
          return wrapObservable(!TextUtils.isEmpty(eTag) ? service.deleteConversation(AuthManager.addAuthPrefix(token), eTag, apiSpaceId, conversationId).map(mapToComapiResult()) : service.deleteConversation(AuthManager.addAuthPrefix(token), apiSpaceId, conversationId)
                  .map(mapToComapiResult()), log, "Deleting conversation " + conversationId);
      }
docs: Returns observable to create a conversation.
  
  @param token          Comapi access token.
  @param conversationId ID of a conversation to delete.
  @param eTag           Tag to specify local data version. Can be null.
  @return Observable to to create a conversation.