logstash 处理json格式的字符串
# 需要用到 logstash-filter-translate，有以下两种加载方式，第二种需要先从已经装好的环境导出来
# 1,/usr/share/logstash/bin/logstash-plugin install logstash-filter-translate
# 2,/usr/share/logstash/bin/logstash-plugin install file:///elk/logstash-filter-translate-3.0.4.zip
