ElasticSearch--warning: usage of JAVA

es和jdk是一个强依赖的关系，所以当我们在新版本的ElasticSearch压缩包中包含有自带的jdk，但是当我们的Linux中已经安装了jdk之后，就会发现启动es的时候优先去找的是Linux中已经装好的jdk，此时如果jdk的版本不一致，就会造成jdk不能正常运行，报错如下：

warning: usage of JAVA_HOME is deprecated, use ES_JAVA_HOME Future versions of Elasticsearch will require Java 11; your Java version from [/usr/local/jdk1.8.0_291/jre] does not meet this requirement. Consider switching to a distribution of Elasticsearch with a bundled JDK. If you are already using a distribution with a bundled JDK, ensure the JAVA_HOME environment variable is not set.

如果Linux服务本来没有配置jdk，则会直接使用es目录下默认的jdk，反而不会报错。

解决办法

1. 进入bin目录

1. 进入bin目录

cd /usr/local/elasticsearch-7.14.0/bin

2.修改elasticsearch-env配置

vim ./elasticsearch-env

# 将jdk修改为es中自带jdk的配置目录,es自带的jdk位置/usr/local/es/elasticsearch-7.14.0/jdk

# now make ES_HOME absolute

ES_HOME=`cd "$ES_HOME"; pwd`

while [ "`basename "$ES_HOME"`" != "bin" ]; do

ES_HOME=`dirname "$ES_HOME"`

done

ES_HOME=`dirname "$ES_HOME"`

# now set the classpath

ES_CLASSPATH="$ES_HOME/lib/*"

# now set the path to java

if [ ! -z "$ES_JAVA_HOME" ]; then

JAVA="$ES_JAVA_HOME/bin/java"

JAVA_TYPE="ES_JAVA_HOME"

elif [ ! -z "$JAVA_HOME" ]; then

# fallback to JAVA_HOME

echo "warning: usage of JAVA_HOME is deprecated, use ES_JAVA_HOME" >&2

#JAVA="$JAVA_HOME/bin/java"

# 将jdk修改为es中自带jdk的配置目录

JAVA="/usr/local/es/elasticsearch-7.14.0/jdk/bin/java"

JAVA_TYPE="JAVA_HOME"

else

# use the bundled JDK (default)

if [ "$(uname -s)" = "Darwin" ]; then

# macOS has a different structure

#JAVA="$ES_HOME/jdk.app/Contents/Home/bin/java"

# 将jdk修改为es中自带jdk的配置目录

JAVA="/usr/local/es/elasticsearch-7.14.0/jdk/bin/java"

else

#JAVA="$ES_HOME/jdk/bin/java"

# 将jdk修改为es中自带jdk的配置目录

JAVA="/usr/local/es/elasticsearch-7.14.0/jdk/bin/java"

fi

JAVA_TYPE="bundled JDK"

fi

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