Updated init, systemd, jvm.options and tests

templates/systemd/elasticsearch.j2

@@ -41,6 +41,9 @@ StandardError=inherit
 LimitNOFILE={{es_max_open_files}}
 {% endif %}
 
+# Specifies the maximum number of processes
+LimitNPROC=2048
+
 # Specifies the maximum number of bytes of memory that may be locked into RAM
 # Set to "infinity" if you use the 'bootstrap.memory_lock: true' option
 # in elasticsearch.yml and 'MAX_LOCKED_MEMORY=unlimited' in {{instance_default_file}}
@@ -54,6 +57,9 @@ TimeoutStopSec=0
 # SIGTERM signal is used to stop the Java process
 KillSignal=SIGTERM
 
+# Send the signal only to the JVM rather than its control group
+KillMode=process
+
 # Java process is never killed
 SendSIGKILL=no