How to use the elasticsearch5.TransportError function in elasticsearch5

Returns:
            a list of matching documents.
        """
        try:
            # TODO: move the ES API call logic to ES helper
            es_query = self._build_es_query(size=size)
            response = self.client.search(index=self.index, body=es_query)
            results = [hit["_source"] for hit in response["hits"]["hits"]]
            return results
        except EsConnectionError as e:
            logger.error(
                "Unable to connect to Elasticsearch: %s details: %s", e.error, e.info
            )
            raise KnowledgeBaseConnectionError(es_host=self.client.transport.hosts)
        except TransportError as e:
            logger.error(
                "Unexpected error occurred when sending requests to Elasticsearch: %s "
                "Status code: %s details: %s",
                e.error,
                e.status_code,
                e.info,
            )
            raise KnowledgeBaseError
        except ElasticsearchException:
            raise KnowledgeBaseError

):
    """Return boolean flag to indicate whether the specified index exists."""

    es_client = es_client or create_es_client(es_host)
    scoped_index_name = get_scoped_index_name(app_namespace, index_name)

    try:
        # Confirm ES connection with a shorter timeout
        es_client.cluster.health(request_timeout=connect_timeout)
        return es_client.indices.exists(index=scoped_index_name)
    except EsConnectionError as e:
        logger.debug(
            "Unable to connect to Elasticsearch: %s details: %s", e.error, e.info
        )
        raise KnowledgeBaseConnectionError(es_host=es_client.transport.hosts)
    except TransportError as e:
        logger.error(
            "Unexpected error occurred when sending requests to Elasticsearch: %s "
            "Status code: %s details: %s",
            e.error,
            e.status_code,
            e.info,
        )
        raise KnowledgeBaseError
    except ElasticsearchException:
        raise KnowledgeBaseError