I am also facing the same issue while installing ESS 5.2.2
C:\elasticsearch-5.2.2>.\bin\elasticsearch
Could not find any executable java binary. Please install java in your PATH
set JAVA_HOME
Press any key to continue . . .
While, If i type java -version and JAVA_HOME, they just seem to be fine
C:\elasticsearch-5.2.2>java -version
java version "1.8.0_121"
Java(TM) SE Runtime Environment (build 1.8.0_121-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.121-b13, mixed mode)
C:\elasticsearch-5.2.2>echo %JAVA_HOME%
C:\Program Files\Java\jdk1.8.0_121;