Introduce ES_USE_IPV4 flag in .bat files

Synchronize the .bat files with the .sh ones by adding ES_USE_IPV4
flag. Higher branches (from 1.4 included) extend this functionality by
introducing elasticsearch.in.bat to mirror elasticsearch.in for *nix
systems.

Relates elastic#8237

bin/elasticsearch.bat

@@ -35,6 +35,14 @@ set JAVA_OPTS=%JAVA_OPTS% -XX:MaxDirectMemorySize=%ES_DIRECT_SIZE%
 
 set JAVA_OPTS=%JAVA_OPTS% -Xss256k
 
+REM set to headless, just in case
+set JAVA_OPTS=%JAVA_OPTS% -Djava.awt.headless=true
+
+REM Force the JVM to use IPv4 stack
+if NOT "%ES_USE_IPV4%" == "" (
+set JAVA_OPTS=%JAVA_OPTS% -Djava.net.preferIPv4Stack=true
+)
+
 REM Enable aggressive optimizations in the JVM
 REM    - Disabled by default as it might cause the JVM to crash
 REM set JAVA_OPTS=%JAVA_OPTS% -XX:+AggressiveOpts

bin/service.bat

@@ -138,11 +138,18 @@ if NOT "%ES_DIRECT_SIZE%" == "" set JAVA_OPTS=%JAVA_OPTS% -XX:MaxDirectMemorySiz
 rem thread stack size
 set JVM_SS=256
 
+REM set to headless, just in case
+set JAVA_OPTS=%JAVA_OPTS% -Djava.awt.headless=true
+
+REM Force the JVM to use IPv4 stack
+if NOT "%ES_USE_IPV4%" == "" (
+set JAVA_OPTS=%JAVA_OPTS% -Djava.net.preferIPv4Stack=true
+)
+
 REM Enable aggressive optimizations in the JVM
 REM    - Disabled by default as it might cause the JVM to crash
 REM set JAVA_OPTS=%JAVA_OPTS% -XX:+AggressiveOpts
 
-
 set JAVA_OPTS=%JAVA_OPTS% -XX:+UseConcMarkSweepGC
 
 set JAVA_OPTS=%JAVA_OPTS% -XX:CMSInitiatingOccupancyFraction=75