make testing work

Author: jsvd

.ci/Dockerfile.elasticsearch

@@ -1,6 +1,6 @@
 ARG ELASTIC_STACK_VERSION
 ARG DISTRIBUTION_SUFFIX
-FROM docker.elastic.co/elasticsearch/elasticsearch$distribution_suffix:$ELASTIC_STACK_VERSION
+FROM docker.elastic.co/elasticsearch/elasticsearch$DISTRIBUTION_SUFFIX:$ELASTIC_STACK_VERSION
 
 ARG plugin_path=/usr/share/plugins/plugin
 ARG es_path=/usr/share/elasticsearch

.ci/docker-compose.override.yml

@@ -24,6 +24,7 @@ services:
         - ELASTIC_STACK_VERSION=$ELASTIC_STACK_VERSION
         - INTEGRATION=${INTEGRATION:-false}
         - SECURE_INTEGRATION=${SECURE_INTEGRATION:-false}
+        - DISTRIBUTION_SUFFIX=${DISTRIBUTION_SUFFIX}
     command: /usr/share/elasticsearch/elasticsearch-run.sh
     tty: true
     ports: