roles/elasticsearch: Add Elasticsearch deployment

The *elasticsearch* role installs Elasticsearch from the Elastic.co Yum
repository and manages basic node configuration.

roles/elasticsearch/templates/jvm.options.j2

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+## JVM configuration
+
+################################################################
+## IMPORTANT: JVM heap size
+################################################################
+##
+## You should always set the min and max JVM heap
+## size to the same value. For example, to set
+## the heap to 4 GB, set:
+##
+## -Xms4g
+## -Xmx4g
+##
+## See https://www.elastic.co/guide/en/elasticsearch/reference/current/heap-size.html
+## for more information
+##
+################################################################
+
+# Xms represents the initial size of total heap space
+# Xmx represents the maximum size of total heap space
+
+-Xms{{ es_xms }}
+-Xmx{{ es_xmx }}
+
+################################################################
+## Expert settings
+################################################################
+##
+## All settings below this section are considered
+## expert settings. Don't tamper with them unless
+## you understand what you are doing
+##
+################################################################
+
+## GC configuration
+-XX:+UseConcMarkSweepGC
+-XX:CMSInitiatingOccupancyFraction=75
+-XX:+UseCMSInitiatingOccupancyOnly
+
+## optimizations
+
+# pre-touch memory pages used by the JVM during initialization
+-XX:+AlwaysPreTouch
+
+## basic
+
+# explicitly set the stack size
+-Xss1m
+
+# set to headless, just in case
+-Djava.awt.headless=true
+
+# ensure UTF-8 encoding by default (e.g. filenames)
+-Dfile.encoding=UTF-8
+
+# use our provided JNA always versus the system one
+-Djna.nosys=true
+
+# turn off a JDK optimization that throws away stack traces for common
+# exceptions because stack traces are important for debugging
+-XX:-OmitStackTraceInFastThrow
+
+# flags to configure Netty
+-Dio.netty.noUnsafe=true
+-Dio.netty.noKeySetOptimization=true
+-Dio.netty.recycler.maxCapacityPerThread=0
+
+# log4j 2
+-Dlog4j.shutdownHookEnabled=false
+-Dlog4j2.disable.jmx=true
+{% if es_tmpdir is defined %}
+
+-Djava.io.tmpdir={{ es_tmpdir }}
+{% endif %}
+
+## heap dumps
+
+# generate a heap dump when an allocation from the Java heap fails
+# heap dumps are created in the working directory of the JVM
+-XX:+HeapDumpOnOutOfMemoryError
+
+# specify an alternative path for heap dumps; ensure the directory exists and
+# has sufficient space
+-XX:HeapDumpPath=/var/lib/elasticsearch
+
+# specify an alternative path for JVM fatal error logs
+-XX:ErrorFile=/var/log/elasticsearch/hs_err_pid%p.log
+{% if es_enable_gc_logging|bool %}
+
+## JDK 8 GC logging
+
+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
+
+# JDK 9+ GC logging
+9-:-Xlog:gc*,gc+age=trace,safepoint:file=/var/log/elasticsearch/gc.log:utctime,pid,tags:filecount=32,filesize=64m
+# due to internationalization enhancements in JDK 9 Elasticsearch need to set the provider to COMPAT otherwise
+# time/date parsing will break in an incompatible way for some date patterns and locals
+9-:-Djava.locale.providers=COMPAT
+
+# temporary workaround for C2 bug with JDK 10 on hardware with AVX-512
+10-:-XX:UseAVX=2
+{% endif %}