在 Kibana5 上使用 metricbeat 5，ES5，我得到这个红色错误：
Visualize: Fielddata is disabled on text fields by default. Set fielddata=true on [beat.name] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory.
这是什么意思？我在哪里配置它？