Added ES 6.8 and 7.6 Support (#205)

Author: G-Arvind

images/elasticsearch/6.8/Dockerfile

@@ -0,0 +1,12 @@
+FROM docker.elastic.co/elasticsearch/elasticsearch:6.8.8
+
+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/6.8/docker-healthcheck.sh

@@ -0,0 +1,12 @@
+#!/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

images/elasticsearch/7.6/Dockerfile

@@ -0,0 +1,12 @@
+FROM docker.elastic.co/elasticsearch/elasticsearch:7.6.2
+
+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/7.6/docker-healthcheck.sh

@@ -0,0 +1,12 @@
+#!/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