elasticsearch 启动时指定jdk版本

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#!/bin/bash　　CONTROLLING STARTUP:

　　This script>　　behavior, those variables are:
　　ES_PATH_CONF -- Path to config directory
　　ES_JAVA_OPTS -- External Java Opts on top of the defaults set
　　Optionally, exact memory values can be set using the `ES_JAVA_OPTS`. Note that
　　the Xms and Xmx lines in the JVM options file must be commented out. Example
　　values are "512m", and "10g".
　　ES_JAVA_OPTS="-Xms8g -Xmx8g" ./bin/elasticsearch
　　#配置自己的jdk1.8
　　export JAVA_HOME=/home/hiekay/jdk1.8.0_181/
　　export PATH=$JAVA_HOME/bin:$PATH
　　source "`dirname "$0"`"/elasticsearch-env
　　ES_JVM_OPTIONS="$ES_PATH_CONF"/jvm.options
　　JVM_OPTIONS=`"$JAVA" -cp "$ES_CLASSPATH" org.elasticsearch.tools.launchers.JvmOptionsParser "$ES_JVM_OPTIONS"`
　　ES_JAVA_OPTS="${JVM_OPTIONS//\$\{ES_TMPDIR\}/$ES_TMPDIR} $ES_JAVA_OPTS"
　　#我添加的jdk判断
　　if [ -x "$JAVA_HOME/bin/java" ]; then
　　JAVA="/home/hiekay/jdk1.8.0_181/bin/java"
　　else
　　JAVA=`which java`
　　fi
　　cd "$ES_HOME"
　　manual parsing to find out, if process should be detached
　　if ! echo $* | grep -E '(^-d |-d$| -d |--daemonize$|--daemonize )' > /dev/null; then
　　exec \
　　"$JAVA" \
　　$ES_JAVA_OPTS \
　　-Des.path.home="$ES_HOME" \
　　-Des.path.conf="$ES_PATH_CONF" \
　　-Des.distribution.flavor="$ES_DISTRIBUTION_FLAVOR" \
　　-Des.distribution.type="$ES_DISTRIBUTION_TYPE" \
　　-cp "$ES_CLASSPATH" \
　　org.elasticsearch.bootstrap.Elasticsearch \
　　"$@"
　　else
　　exec \
　　"$JAVA" \
　　$ES_JAVA_OPTS \
　　-Des.path.home="$ES_HOME" \
　　-Des.path.conf="$ES_PATH_CONF" \
　　-Des.distribution.flavor="$ES_DISTRIBUTION_FLAVOR" \
　　-Des.distribution.type="$ES_DISTRIBUTION_TYPE" \
　　-cp "$ES_CLASSPATH" \
　　org.elasticsearch.bootstrap.Elasticsearch \
　　"$@" \
　　 /dev/null ; then
　　exit 1
　　fi
　　exit 0
　　fi
　　exit $?