Fix handling of paths containing parentheses

This commit fixes an issue with the handling of paths containing
parentheses on Windows. When such a path is used as a component of
Elasticsearch home, then a later echo statement that is guarded by an if
will fail because the parentheses in the path will be confused with the
parentheses defining the if block. This commit fixes the issue by
protecting this echo statement by wrapping the possibly offending path
in quotes.

Relates elastic#26916

distribution/src/main/resources/bin/elasticsearch-service.bat

@@ -163,15 +163,15 @@ for %%a in ("%ES_JAVA_OPTS:;=","%") do (
 @endlocal & set JVM_MS=%JVM_MS% & set JVM_MX=%JVM_MX% & set JVM_SS=%JVM_SS%
 
 if "%JVM_MS%" == "" (
-  echo minimum heap size not set; configure using -Xms via %ES_JVM_OPTIONS% or ES_JAVA_OPTS
+  echo minimum heap size not set; configure using -Xms via "%ES_JVM_OPTIONS%" or ES_JAVA_OPTS
   goto:eof
 )
 if "%JVM_MX%" == "" (
-  echo maximum heap size not set; configure using -Xmx via %ES_JVM_OPTIONS% or ES_JAVA_OPTS
+  echo maximum heap size not set; configure using -Xmx via "%ES_JVM_OPTIONS%" or ES_JAVA_OPTS
   goto:eof
 )
 if "%JVM_SS%" == "" (
-  echo thread stack size not set; configure using -Xss via %ES_JVM_OPTIONS% or ES_JAVA_OPTS
+  echo thread stack size not set; configure using -Xss via "%ES_JVM_OPTIONS%" or ES_JAVA_OPTS
   goto:eof
 )