Add elastic search client 7.x support and drop 5.x as there are dependancy problems..

Author: olsgreen

composer.json

@@ -12,7 +12,7 @@
     "require": {
         "php": "^7.2|^8.0",
         "laravel/scout": "^8.0|^9.0",
-        "elasticsearch/elasticsearch": "^5.0|^6.0"
+        "elasticsearch/elasticsearch": "^6.8|^7.0"
     },
      "require-dev": {
         "mockery/mockery": "~1.3.3",