1、Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000085330000, 2060255232, 0) failed; error=’Cannot allocate memory’ (errno=12)
由于elasticsearch5.0默认分配jvm空间大小为2g，修改jvm空间分配

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vim config/jvm.options
-Xms2g
-Xmx2g
修改为
-Xms512m
-Xmx512m

2、max number of threads [1024] for user [elasticsearch] is too low, increase to at least [2048] 修改 /etc/security/limits.d/90-nproc.conf

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soft nproc 1024

soft nproc 2048