ERROR: [1] bootstrap checks failed
[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
[2]: max number of threads [3795] for user [es] is too low, increase to at least [4096]
[3]: max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
es高版本对资源要求较高，linux系统默认配置不能满足它的要求，所以需要单独配置
解决方法：[1]: max file descriptors [4096] for elasticsearch process is too low, increase to at least [65535]
修改vi /etc/security/limits.conf 文件，加入配置
* hard nofile 65535 # *可以是es启动用户 * soft nofile 65535
[2]: max number of threads [3795] for user [es] is too low, increase to at least [4096]
修改vi /etc/security/limits.conf 文件，加入配置
es - nproc 4096 # es是我的启动用户
上面两个配置项改完后，es启动用户重新登录就会生效；
[3]：max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]
修改/etc/sysctl.config文件，加入下面配置
vi /etc/sysctl.conf vm.max_map_count=262144
执行命令，立即生效
/sbin/sysctl -p vm.max_map_count = 262144 启动成功
