Elasticsearch 報錯：Fielddata is disabled on text fields by default. Set `fielddata=true` on [`your_fie

• Elasticsearch 報錯：

Fielddata is disabled on text fields by default.  Set `fielddata=true` on
[`your_field_name`] in order to load  fielddata in memory by uninverting the
inverted index. Note that this can however use significant memory.

解決：https://www.elastic.co/guide/en/elasticsearch/reference/current/fielddata.html#enable-fielddata-text-fields