Increase CMS threshold from 50% to 70% because the steady state old-g…

…en heap usage settles around 60% so having the CMS threshold too low meant it runs continuously and never reduces the heap usage enough and so it runs again, chewing up CPU

solr/bin/solr

@@ -1910,7 +1910,7 @@ function launch_solr() {
         '-XX:+CMSScavengeBeforeRemark' \
         '-XX:PretenureSizeThreshold=64m' \
         '-XX:+UseCMSInitiatingOccupancyOnly' \
-        '-XX:CMSInitiatingOccupancyFraction=50' \
+        '-XX:CMSInitiatingOccupancyFraction=70' \
         '-XX:CMSMaxAbortablePrecleanTime=6000' \
         '-XX:+CMSParallelRemarkEnabled' \
         '-XX:+ParallelRefProcEnabled' \