windows启动elasticsearch报错：warning: Falling back to java on path. This behavior is deprecated. Specify JAVA_HOME
Cause: The machine has been installed on the windows java, but not configured environment variables JAVA_HOME
Because you can install multiple JDK and JVM on one computer, in order to avoid confusion, you can add the environment variable JAVA_HOME, specify a default JDK for use.
Use the echo command to check the environment variable JAVA_HOME
echo %JAVA_HOME%E:\elasticsearch\bin>echo %JAVA_HOME%
%JAVA_HOME%Solution:
The JAVA_HOME environment variable can be added to.
After setting environment variables, you need to restart the command line in order to take effect.