This commit adds a note regarding the difference in configuration for
the Windows service heap size from any other installation of
Elasticsearch.
Relates #18606
This commit adds a new configuration file jvm.options to centralize and
simplify management of JVM options. This separates the configuration of
the JVM from the packaging scripts (bin/elasticsearch*, bin/service.bat,
and init.d/elasticsearch) simplifying end-user operational management of
custom JVM options.