flume到kafka动态topic

json日志使用拦截器，字段取出放到header里

a1.sources.r1.interceptors = i1

a1.sources.r1.interceptors.i1.type = regex_extractor
a1.sources.r1.interceptors.i1.regex = "自定义字段":"(\\w+)"
a1.sources.r1.interceptors.i1.serializers = s1

a1.sources.r1.interceptors.i1.serializers.s1.name = topic

topic不要自定义，1.7 源码固定是 "topic",...如果自定义的话..淡淡的忧伤.....

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#设置Kafka的Topic

a1.sinks.k1.topic=%{topic}

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