Elasticsearch 日期类型的自动监测，官方文档

资料	网址
Elasticsearch Reference [7.3] » Mapping » Field datatypes » Date datatype	https://www.elastic.co/guide/en/elasticsearch/reference/current/date.html
Elasticsearch Reference [7.3] » Mapping » Dynamic Mapping » Dynamic field mapping	https://www.elastic.co/guide/en/elasticsearch/reference/current/dynamic-field-mapping.html#date-detection
Elasticsearch Reference [7.3] » Mapping » Mapping parameters » format	https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-date-format.html#custom-date-formats

Date 类型的默认 format："strict_date_optional_time||epoch_millis"