elasticsearch：max number of threads [3818] for user [es] is too low, increase to at least [4096]

elasticsearch版本：6.2.4
启动elasticsearch报错：

max number of threads [3818] for user [es] is too low, increase to at least [4096]

意思是elasticsearch最大线程数目太低

解决方案：

修改 /etc/security/limits.conf
在文件末尾增加以下两行：

es  soft nproc  4096
es  hard nproc  4096

注意：es是我自己的用户名，如果不填，可以用*代替。

再重新启动es即可。