reverted default conf. Added cmd line documentaiton

README.md

@@ -383,3 +383,6 @@ are applies. In particular:
  - the Elasticsearch prefix used for the index aliases is different.
 
 See the `backend/src/main/resources/application.yml` file for details.
+
+You can adapt the elasticsearch index used with the following parameter
+java -jar backend/build/libs/data-discovery.jar --data-discovery.elasticsearch-prefix="data-discovery-staging-"

backend/src/main/resources/application.yml

@@ -77,7 +77,7 @@ spring:
       password: f01a7031fc17
 
 data-discovery:
-  elasticsearch-prefix: 'data-discovery-staging-'
+  elasticsearch-prefix: 'data-discovery-dev-'
   resource-dir: /tmp/data-discovery-dev/resources
 
 server: