Support for FieldType (mapping) version is missing

Support for version FieldType/mapping is missing:

[ElasticSearch documentation](https://www.elastic.co/guide/en/elasticsearch/reference/7.17/mapping-types.html) vs. [FieldType](https://github.com/spring-projects/spring-data-elasticsearch/blob/main/src/main/java/org/springframework/data/elasticsearch/annotations/FieldType.java)