elasticSearch数据持久化，默认情况不启用数据保存，故数据一般会几分钟就消失，按以下步骤保存索引数据。

#不同的集群名字不能相同。
cluster.name: es_vm_test
node.name: vmmaster
network.host: 0.0.0.0
http.port: 9200
#数据索引保存
path.data: /home/abc/elk-5.5.1/elkdata/data
path.logs: /home/abc/elk-5.5.1/elkdata/log
#关闭登录验证
xpack.security.enabled: false

以下是基于elk+lnmp开源进行测试验证。
也可以参考官网的实现方法：https://kibana.logstash.es/content/logstash/plugins/codec/json.html
https://kibana.logstash.es/content/logstash/plugins/codec/multiline.html
在官网文档中，有较多应用场景：
https://kibana.logstash.es/content/
https://kibana.logstash.es/content/logstash/examples/

1.抓取nginx日志

input {
    file {
        # path => ["/home/wwwlogs/h5.vim.vim.com.log", "/home/wwwlogs/h5.vim.vim.com2.log"]
	path => "/home/wwwlogs/h5.vim.vim.com.log"
        exclude => "*.zip"
        type => "java"
        add_field => [ "domain", "h5.vim.vim.com" ]
        codec => multiline {
                      pattern => "^\s+"
                      what => previous
              }
    }
    file {
        # path => ["/home/wwwlogs/h5.api.vim.vim.com.log", "/home/wwwlogs/h5.api.vim.vim.com2.log"]
	path => "/home/wwwlogs/h5.api.vim.vim.com.log"
        exclude => ["*.zip", "*.gz"]
        type => "java"
        add_field => [ "domain", "h5.api.vim.vim.com" ]
        codec => multiline {
                        pattern => "^\s+"
                        what => previous
                 }
    }
}
filter {

}
output {
    stdout { 
		codec => rubydebug 
	}
    elasticsearch {
        hosts => ["0.0.0.0:9200"]
        index => "logstash-%{domain}-%{+YYYY.MM.dd}"
    }
}

2.定期清理索引

#!/bin/bash

# --------------------------------------------------------------
# This script is to delete ES indices older than specified days.
# Version: 1.0
# --------------------------------------------------------------

function usage() {
        echo "Usage: `basename $0` -s ES_SERVER -d KEEP_DAYS [-w INTERVAL]"
}


PREFIX='logstash-'
WAITTIME=2
NOW=`date  +%s.%3N`
LOGPATH=/apps/logs/elasticsearch


while getopts d:s:w: opt
do
        case $opt in
        s) SERVER="$OPTARG";;
        d) KEEPDAYS="$OPTARG";;
        w) WAITTIME="$OPTARG";;
        *) usage;;
        esac
done

if [ -z "$SERVER" -o -z "$KEEPDAYS" ]; then
        usage
fi

if [ ! -d $LOGPATH ]; then
        mkdir -p $LOGPATH
fi


INDICES=`curl -s $SERVER/_cat/indices?h=index | grep -P '^logstash-.*\d{4}.\d{2}.\d{2}' | sort`
for index in $INDICES
do
        date=`echo $index | awk -F '-' '{print $NF}' | sed 's/\./-/g' | xargs -I{} date -d {} +%s.%3N`
        delta=`echo "($NOW-$date)/86400" | bc`
        if [ $delta -gt $KEEPDAYS ]; then
                echo "deleting $index" | tee -a $LOGPATH/es_delete_indices.log
                curl -s -XDELETE $SERVER/$index | tee -a $LOGPATH/es_delete_indices.log
                echo | tee -a $LOGPATH/es_delete_indices.log
                sleep $WAITTIME
        fi
done