es进程异常退出，es日志和系统日志都无相关信息，求助各位大大~

各位大大，我们跑在生产上的集群最近规模扩大后（50+节点），经常会出现es进程异常消失的情况，就是跑着跑着就没了，然后被定时任务拉起来，我们在es的日志和系统日志中都没有发现相关错误，没有OOM被系统kill的日志，es日志如下，有一些young gc，然后就掉线，被定时任务自动启动，频繁的话分片恢复时对业务有一定影响，请问该如何排查呢，谢谢！
es版本是2.4.3  OS是RedHat 6.7[2018-06-20 15:41:13,027][INFO ][monitor.jvm              ] [30.24.4.33] [gc][young][838836][170507] duration [701ms], collections [1]/[1.4s], total
[701ms]/[4.6h], memory [17.7gb]->[16.3gb]/[30.6gb], all_pools {[young] [1.8gb]->[17.4mb]/[2.7gb]}{[survivor] [357.7mb]->[357.7mb]/[357.7mb]}{[old] [1
5.5gb]->[16gb]/[27.5gb]}
[2018-06-20 15:46:13,284][WARN ][monitor.jvm              ] [30.24.4.33] [gc][young][839131][170592] duration [1.5s], collections [1]/[1.8s], total [
1.5s]/[4.6h], memory [17.6gb]->[15.9gb]/[30.6gb], all_pools {[young] [2.3gb]->[79.1mb]/[2.7gb]}{[survivor] [57.4mb]->[357.7mb]/[357.7mb]}{[old] [15.2
gb]->[15.5gb]/[27.5gb]}
[2018-06-20 15:46:15,730][INFO ][monitor.jvm              ] [30.24.4.33] [gc][young][839133][170593] duration [737ms], collections [1]/[1.4s], total
[737ms]/[4.6h], memory [17.6gb]->[16.4gb]/[30.6gb], all_pools {[young] [1.7gb]->[28.7mb]/[2.7gb]}{[survivor] [357.7mb]->[357.7mb]/[357.7mb]}{[old] [1
5.5gb]->[16gb]/[27.5gb]}
[2018-06-20 16:15:03,585][WARN ][bootstrap                ] running as ROOT user. this is a bad idea!
[2018-06-20 16:15:03,596][WARN ][bootstrap                ] unable to install syscall filter: seccomp unavailable: CONFIG_SECCOMP not compiled into k
ernel, CONFIG_SECCOMP and CONFIG_SECCOMP_FILTER are needed
[2018-06-20 16:15:19,840][INFO ][node                     ] [30.24.4.33] version[2.4.3], pid[59279], build[${build/2018-04-18T03:05:39Z]
[2018-06-20 16:15:19,840][INFO ][node                     ] [30.24.4.33] initializing ...
[2018-06-20 16:15:20,449][INFO ][plugins                  ] [30.24.4.33] modules [reindex, lang-expression, lang-groovy], plugins [], sites []
[2018-06-20 16:15:20,502][INFO ][env                      ] [30.24.4.33] using [1] data paths, mounts [[/wls (/dev/mapper/VolGroup01-LVwls)]], net us
able_space [3.9tb], net total_space [5tb], spins? [no], types [ext4]