Initial prototype

lib/symbols.js

@@ -0,0 +1,15 @@
+'use strict'
+
+const kTransport = Symbol('elasticsearch-transport')
+const kConnection = Symbol('elasticsearch-connection')
+const kConnectionPool = Symbol('elasticsearch-connection-pool')
+const kSerializer = Symbol('elasticsearch-serializer')
+const kSelector = Symbol('elasticsearch-selector')
+
+module.exports = {
+  kTransport,
+  kConnection,
+  kConnectionPool,
+  kSerializer,
+  kSelector
+}