Mohammadali Jalalkamali

This PR addresses GH-2188 (Converters with JDBCType.OTHER broken). ### Summary Custom converters that return `JdbcValue` with `JDBCType.OTHER` stopped working correctly for string-based queries. `StringBasedJdbcQuery` treated `JDBCType.OTHER` as a special case...

This PR addresses #4873 by using `JsonWriterSettings` with `JsonMode.SHELL` in `SerializationUtils` so that `ObjectId` values in MongoTemplate/ReactiveMongoTemplate DEBUG logs are rendered as `ObjectId("…")` instead of `{"$oid":"…"}`.

Relates to #591. This PR adds a small Spring Data Elasticsearch example that demonstrates using `org.springframework.data.elasticsearch.core.query.Criteria` against a nested field. Changes: - Introduced a `Talk` document with a `speakers` field...