Minor rename in Elasticsearch install

Author: carlosadiegosysdig

resources/elasticsearch/INSTALL.md

@@ -47,7 +47,7 @@ spec:
           valueFrom:
             configMapKeyRef:
               key: elasticsearch.adminuser
-              name: sysdigcloud-config
+              name: elasticsearch-config
         - name: ES_URI
           value: https://$(ELASTIC_USER):$(ELASTICSEARCH_ADMIN_PASSWORD)@YOUR-HOST:9200
       envFrom:
@@ -59,4 +59,4 @@ spec:
 Apply by configuration changes by executing the following:
 ```
 kubectl apply -f exporter_with_credentials.yaml
-```
+```