prep for elk 8.x, pave way for next t-pot release

docker/elk/elasticsearch/Dockerfile

@@ -7,8 +7,6 @@ ENV ES_VER=7.16.2 \
 # Include dist
 ADD dist/ /root/dist/
 #
-# Setup env and apt
-#RUN sed -i 's/dl-cdn/dl-2/g' /etc/apk/repositories && \
 RUN apk -U --no-cache add \
              aria2 \
              bash \

docker/elk/elasticsearch/dist/elasticsearch.yml

@@ -2,7 +2,6 @@ cluster.name: tpotcluster
 node.name: "tpotcluster-node-01"
 xpack.ml.enabled: false
 xpack.security.enabled: false
-#xpack.ilm.enabled: false
 path:
     logs: /data/elk/log
     data: /data/elk/data
@@ -10,7 +9,5 @@ http.host: 0.0.0.0
 http.cors.enabled: true
 http.cors.allow-origin: "*"
 indices.query.bool.max_clause_count: 2000
-cluster.initial_master_nodes:
-- "tpotcluster-node-01"
-discovery.zen.ping.unicast.hosts:
-- localhost 
+cluster.routing.allocation.disk.watermark.enable_for_single_data_node: true
+discovery.type: single-node