elasticsearch: add 7.x version support (#16646)

Adds a new version option 7.0+ (70 internally).
Version 7.0+ doesn't include document types in index mappings 
so support for handling this have been added.
Version 7.0+ returns number of hits in a different way so 
support for handling this have been added.
Version 7.0+ doesn't support sending 
max_concurrent_shard_requests in multisearch header so 
support for sending this in query string have been added.
Update elastic6 docker block and dashboards (devenv) to use 
6.7.1 images, filebeat index name is now filebeat-YYYY.MM.DD 
and dashboard include correct tags and links.
Add elastic7 docker block and provisioning (devenv).
Updates documentation regarding new version.

Closes #15622

devenv/docker/blocks/elastic6/docker-compose.yaml

@@ -1,7 +1,7 @@
 # You need to run 'sysctl -w vm.max_map_count=262144' on the host machine
 
   elasticsearch6:
-    image: docker.elastic.co/elasticsearch/elasticsearch-oss:6.2.4
+    image: docker.elastic.co/elasticsearch/elasticsearch-oss:6.7.1
     command: elasticsearch
     ports:
       - "11200:9200"
@@ -15,7 +15,7 @@
       FD_PORT: 11200
 
   filebeat6:
-    image: docker.elastic.co/beats/filebeat:6.2.4
+    image: docker.elastic.co/beats/filebeat-oss:6.7.1
     command: filebeat -e -strict.perms=false
     volumes:
       - ./docker/blocks/elastic6/filebeat.yml:/usr/share/filebeat/filebeat.yml:ro

devenv/docker/blocks/elastic7/docker-compose.yaml

@@ -0,0 +1,23 @@
+# You need to run 'sysctl -w vm.max_map_count=262144' on the host machine
+
+  elasticsearch7:
+    image: docker.elastic.co/elasticsearch/elasticsearch-oss:7.0.0
+    command: elasticsearch -E "discovery.type=single-node"
+    ports:
+      - "12200:9200"
+      - "12300:9300"
+
+  fake-elastic7-data:
+    image: grafana/fake-data-gen
+    network_mode: bridge
+    environment:
+      FD_DATASOURCE: elasticsearch7
+      FD_PORT: 12200
+
+  filebeat7:
+    image: docker.elastic.co/beats/filebeat-oss:7.0.0
+    command: filebeat -e -strict.perms=false
+    volumes:
+      - ./docker/blocks/elastic7/filebeat.yml:/usr/share/filebeat/filebeat.yml:ro
+      - /var/log:/var/log:ro
+      - ../data/log:/var/log/grafana:ro

devenv/docker/blocks/elastic7/elasticsearch.yml

@@ -0,0 +1,2 @@
+script.inline: on
+script.indexed: on