update dependencies

Signed-off-by: huanggze <loganhuang@yunify.com>

vendor/github.com/elastic/go-elasticsearch/v5/estransport/doc.go

@@ -0,0 +1,17 @@
+/*
+Package estransport provides the transport layer for the Elasticsearch client.
+
+It is automatically included in the client provided by the github.com/elastic/go-elasticsearch package
+and is not intended for direct use: to configure the client, use the elasticsearch.Config struct.
+
+The default HTTP transport of the client is http.Transport.
+
+The package defines the "Selector" interface for getting a URL from the list. At the moment,
+the implementation is rather minimal: the client takes a slice of url.URL pointers,
+and round-robins across them when performing the request.
+
+The package defines the "Logger" interface for logging information about request and response.
+It comes with several bundled loggers for logging in text and JSON.
+
+*/
+package estransport