Update ES to version 6

Author: intelligide

composer.json

@@ -5,7 +5,7 @@
     "require": {
         "php": ">=5.6.4",
         "laravel/scout": "^3.0",
-        "elasticsearch/elasticsearch": "^5.0"
+        "elasticsearch/elasticsearch": "^6.0"
     },
      "require-dev": {
         "fzaninotto/faker": "~1.4",
@@ -23,7 +23,7 @@
         }
     },
     "suggest": {
-        "elasticsearch/elasticsearch": "Required to use the Elasticsearch engine (^5.0)."
+        "elasticsearch/elasticsearch": "Required to use the Elasticsearch engine (^6.0)."
     },
     "extra": {
         "laravel": {