nohup ./elasticsearch & 可以后台开启elasticsearch服务
ps-ef列出所有进程
ps-ef | grep elastic...查找elastic。。的进程
kill 进程数字（如：1932，对应java开头的进程）
例子如下：
login as: elasticsearch
elasticsearch@192.168.10.29's password:
Last login: Wed Sep 21 11:29:06 2016 from 172.16.42.225
[elasticsearch@centos29 ~]$ cd elasticsearch
[elasticsearch@centos29 elasticsearch]$ cd bin
[elasticsearch@centos29 bin]$ ps -ef | grep elas
root 1233 1646 0 10:26 ? 00:00:00 sshd: elasticsearch [priv]
500 1237 1233 0 10:26 ? 00:00:00 sshd: elasticsearch@pts/2
500 2468 1 23 11:30 ? 00:00:16 /usr/bin/java -Xms256m -Xmx1g -Djava.awt.headless=true -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFraction=75 -XX:+UseCMSInitiatingOccupancyOnly -XX:+HeapDumpOnOutOfMemoryError -XX:+DisableExplicitGC -Dfile.encoding=UTF-8 -Djna.nosys=true -Des.path.home=/usr/elasticsearch/elasticsearch -cp /usr/elasticsearch/elasticsearch/lib/elasticsearch-2.1.1.jar:/usr/elasticsearch/elasticsearch/lib/* org.elasticsearch.bootstrap.Elasticsearch start
root 2567 1646 0 11:30 ? 00:00:00 sshd: elasticsearch [priv]
500 2572 2567 0 11:31 ? 00:00:00 sshd: elasticsearch@pts/0
500 2598 2573 0 11:31 pts/0 00:00:00 grep elas
[elasticsearch@centos29 bin]$ kill 2468
[elasticsearch@centos29 bin]$ nohup ./elasticsearch &
[1] 2608
[elasticsearch@centos29 bin]$ nohup: ignoring input and appending output to `nohup.out