Migrate some of the Docker tests from old repository (#49792)

Backport of #49079. Reimplement a number of the tests from
elastic/elasticsearch-docker.

There is also one Docker image fix here, which is that two of the provided
config files had different file permissions to the rest. I've fixed this
with another RUN chmod while building the image, and adjusted the
corresponding packaging test.

Author: pugnascotia

distribution/docker/src/docker/Dockerfile

@@ -33,6 +33,7 @@ RUN grep ES_DISTRIBUTION_TYPE=tar /usr/share/elasticsearch/bin/elasticsearch-env
 RUN mkdir -p config data logs
 RUN chmod 0775 config data logs
 COPY config/elasticsearch.yml config/log4j2.properties config/
+RUN chmod 0660 config/elasticsearch.yml config/log4j2.properties
 
 ################################################################################
 # Build stage 1 (the actual elasticsearch image):

distribution/docker/src/docker/bin/docker-entrypoint.sh

@@ -85,9 +85,8 @@ declare -a es_opts
 while IFS='=' read -r envvar_key envvar_value
 do
   # Elasticsearch settings need to have at least two dot separated lowercase
-  # words, e.g. `cluster.name`, except for `processors` which we handle
-  # specially
-  if [[ "$envvar_key" =~ ^[a-z0-9_]+\.[a-z0-9_]+ || "$envvar_key" == "processors" ]]; then
+  # words, e.g. `cluster.name`
+  if [[ "$envvar_key" =~ ^[a-z0-9_]+\.[a-z0-9_]+ ]]; then
     if [[ ! -z $envvar_value ]]; then
       es_opt="-E${envvar_key}=${envvar_value}"
       es_opts+=("${es_opt}")

qa/os/build.gradle

@@ -36,6 +36,10 @@ dependencies {
   compile "commons-logging:commons-logging:${versions.commonslogging}"
 
   compile project(':libs:elasticsearch-core')
+
+  testCompile "com.fasterxml.jackson.core:jackson-annotations:${versions.jackson}"
+  testCompile "com.fasterxml.jackson.core:jackson-core:${versions.jackson}"
+  testCompile "com.fasterxml.jackson.core:jackson-databind:${versions.jackson}"
 }
 
 forbiddenApisTest {