add a es client for auditing, events, and logging

Signed-off-by: wanjunlei <wanjunlei@yunify.com>

pkg/simple/client/es/versions/interface.go

@@ -0,0 +1,9 @@
+package versions
+
+// versioned es client interface
+type Client interface {
+	Search(indices string, body []byte, scroll bool) ([]byte, error)
+	Scroll(id string) ([]byte, error)
+	ClearScroll(id string)
+	GetTotalHitCount(v interface{}) int64
+}