-Xms8g
-Xmx8g

-XX:+UseConcMarkSweepGC
-XX:CMSInitiatingOccupancyFraction=75
-XX:+UseCMSInitiatingOccupancyOnly

-XX:+AlwaysPreTouch

-Xss1m
-Djava.awt.headless=true

-Dfile.encoding=UTF-8
-Djna.nosys=true

-XX:-OmitStackTraceInFastThrow

-Dio.netty.noUnsafe=true
-Dio.netty.noKeySetOptimization=true
-Dio.netty.recycler.maxCapacityPerThread=0

-Dlog4j.shutdownHookEnabled=false
-Dlog4j2.disable.jmx=true
-Djava.io.tmpdir=${ES_TMPDIR}

-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=/var/lib/elasticsearch

-XX:ErrorFile=/var/log/elasticsearch/hs_err_pid%p.log

8:-XX:+PrintGCDetails
8:-XX:+PrintGCDateStamps
8:-XX:+PrintTenuringDistribution
8:-XX:+PrintGCApplicationStoppedTime
8:-Xloggc:/var/log/elasticsearch/gc.log
8:-XX:+UseGCLogFileRotation
8:-XX:NumberOfGCLogFiles=32
8:-XX:GCLogFileSize=64m

9-:-Xlog:gc*,gc+age=trace,safepoint:file=/var/log/elasticsearch/gc.log:utctime,pid,tags:filecount=32,filesize=64m
9-:-Djava.locale.providers=COMPAT
10-:-XX:UseAVX=2