TASK: Change min version for flowpack/elasticsearch to 5.0

Author: daniellienert

composer.json

@@ -8,7 +8,7 @@
         "php": "^7.2",
         "ext-json": "*",
 
-        "flowpack/elasticsearch": " ^4.0",
+        "flowpack/elasticsearch": " ^5.0 || dev-master",
         "neos/content-repository": "^5.0",
         "neos/content-repository-search": "^3.0 || dev-master",
         "neos/eel": "^6.0",