MCLOUD-6219: Add ES 7.7 image to docker (#253)

Author: oshmyheliuk

images/elasticsearch/7.7/Dockerfile

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+FROM docker.elastic.co/elasticsearch/elasticsearch:7.7.1
+
+RUN echo "xpack.security.enabled: false" >> /usr/share/elasticsearch/config/elasticsearch.yml
+RUN echo "discovery.type: single-node" >> /usr/share/elasticsearch/config/elasticsearch.yml
+RUN bin/elasticsearch-plugin install -b analysis-icu && \
+    bin/elasticsearch-plugin install -b analysis-phonetic
+
+ADD docker-healthcheck.sh /docker-healthcheck.sh
+
+HEALTHCHECK --retries=3 CMD ["bash", "/docker-healthcheck.sh"]
+
+EXPOSE 9200 9300

images/elasticsearch/7.7/docker-healthcheck.sh

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+#!/bin/bash
+set -eo pipefail
+
+if health="$(curl -fsSL "http://${ES_HOST:-elasticsearch}:${ES_PORT:-9200}/_cat/health?h=status")"; then
+  health="$(echo "$health" | sed -r 's/^[[:space:]]+|[[:space:]]+$//g')" # trim whitespace (otherwise we'll have "green ")
+  if [ "$health" = 'green' ] || [ "$health" = 'yellow' ]; then
+    exit 0
+  fi
+  echo >&2 "Unexpected health status: $health"
+fi
+
+exit 1