make elasticsearch a peer dependency

package.json

@@ -32,6 +32,7 @@
     "babel-eslint": "~4.1.8",
     "babel-plugin-add-module-exports": "~0.1.2",
     "babel-preset-es2015": "~6.6.0",
+    "elasticsearch": "~12.0.0",
     "eslint": "~1.10.3",
     "eslint-plugin-mocha": "~1.1.0",
     "eslint-plugin-react": "~4.2.3",
@@ -43,9 +44,11 @@
     "retire": "~1.1.5",
     "sinon": "~1.17.3"
   },
+  "peerDependencies": {
+    "elasticsearch": ">=11.0.1"
+  },
   "dependencies": {
     "debug": "~2.2.0",
-    "elasticsearch": "~11.0.1",
     "in-publish": "~2.0.0",
     "moment": "~2.11.1",
     "puid": "~1.0.5"