Adapt to API changes in Spring Data Commons.

spring-projects/spring-data-commons#2518 introduced TypeInformation.getTypeDescriptor() which we need to implement in our custom FieldTypeInformation.

spring-data-mongodb/src/main/java/org/springframework/data/mongodb/core/convert/MappingMongoConverter.java

@@ -44,6 +44,7 @@ import org.springframework.context.ApplicationContext;
 import org.springframework.context.ApplicationContextAware;
 import org.springframework.core.CollectionFactory;
 import org.springframework.core.convert.ConversionService;
+import org.springframework.core.convert.TypeDescriptor;
 import org.springframework.core.convert.support.DefaultConversionService;
 import org.springframework.data.annotation.Reference;
 import org.springframework.data.convert.CustomConversions;
@@ -2189,6 +2190,11 @@ public class MappingMongoConverter extends AbstractMongoConverter implements App
 		public org.springframework.data.util.TypeInformation<? extends S> specialize(ClassTypeInformation type) {
 			return delegate.specialize(type);
 		}
+
+		@Override
+		public TypeDescriptor toTypeDescriptor() {
+			return delegate.toTypeDescriptor();
+		}
 	}
 
 	/**