Revert "Docker: ES requires disabling security to work"

This reverts commit 151504f.

We want to test ES closer to production, so we need to enable security.

Author: stsewd

dockerfiles/docker-compose-search.yml

@@ -24,7 +24,6 @@ services:
       - node.name=search
       - cluster.routing.allocation.disk.threshold_enabled=false
       - cluster.info.update.interval=30m
-      - xpack.security.enabled=false
       - "ES_JAVA_OPTS=-Xms128m -Xmx128m"
       - ELASTIC_PASSWORD=password
     ports: