Temporarily switching to latest for integration tests (#6416)

* Temporarily switching to `latest` for integration tests

The Elasticsearch snapshots are broken for a several days
(xpack installation fails). This temporarily switches to using
latest (currently 6.2.1) for our testing, so we don't get used
to the builds being red.  Install -platinum in 'latest' so we can
test with Machine Learning

libbeat/scripts/Makefile

@@ -55,7 +55,9 @@ STRESS_TESTS?=false ## @testing if true, "make test" and "make testsuite" run al
 GOX_OS?=linux darwin windows freebsd netbsd openbsd ## @Building List of all OS to be supported by "make crosscompile".
 GOX_OSARCH?=!darwin/arm !darwin/arm64 !darwin/386 ## @building Space separated list of GOOS/GOARCH pairs to build by "make crosscompile".
 GOX_FLAGS?= ## @building Additional flags to append to the gox command used by "make crosscompile".
-TESTING_ENVIRONMENT?=snapshot## @testing The name of the environment under test
+# XXX: Should be switched back to `snapshot` once the Elasticsearch
+# snapshots are working. https://github.com/elastic/beats/pull/6416
+TESTING_ENVIRONMENT?=latest## @testing The name of the environment under test
 BEAT_VERSION=$(shell head -n 1 ${ES_BEATS}/libbeat/docs/version.asciidoc | cut -c 17- )
 COMMIT_ID=$(shell git rev-parse HEAD)
 DOCKER_COMPOSE_PROJECT_NAME?=${BEAT_NAME}${TESTING_ENVIRONMENT}${BEAT_VERSION}${COMMIT_ID} ## @testing The name of the docker-compose project used by the integration and system tests

testing/environments/latest.yml

@@ -3,7 +3,7 @@
 version: '2.1'
 services:
   elasticsearch:
-    image: docker.elastic.co/elasticsearch/elasticsearch:6.2.1
+    image: docker.elastic.co/elasticsearch/elasticsearch-platinum:6.2.1
     healthcheck:
       test: ["CMD", "curl", "-f", "http://localhost:9200"]
     environment: