[MongoDB-Escape dots '.' in map key] Map key contains dots but no replacement was configured!

org.springframework.data.mapping.MappingException: Map key bankInfo.cardNo contains dots but no replacement was configured! Make sure map keys don't contain dots in the first place or configure an appropriate replacement!
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.potentiallyEscapeMapKey(MappingMongoConverter.java:780)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.prepareMapKey(MappingMongoConverter.java:762)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeMapInternal(MappingMongoConverter.java:729)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.createMap(MappingMongoConverter.java:651)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writePropertyInternal(MappingMongoConverter.java:540)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeProperties(MappingMongoConverter.java:508)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:484)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:458)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeCollectionInternal(MappingMongoConverter.java:704)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.createCollection(MappingMongoConverter.java:620)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writePropertyInternal(MappingMongoConverter.java:534)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeProperties(MappingMongoConverter.java:508)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:484)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:458)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeMapInternal(MappingMongoConverter.java:739)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.createMap(MappingMongoConverter.java:651)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writePropertyInternal(MappingMongoConverter.java:540)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeProperties(MappingMongoConverter.java:508)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:484)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.writeInternal(MappingMongoConverter.java:458)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.write(MappingMongoConverter.java:402)
	at org.springframework.data.mongodb.core.convert.MappingMongoConverter.write(MappingMongoConverter.java:79)
	at org.springframework.data.mongodb.core.MongoTemplate.toDocument(MongoTemplate.java:1071)
	at org.springframework.data.mongodb.core.MongoTemplate.doInsert(MongoTemplate.java:1049)
	at org.springframework.data.mongodb.core.MongoTemplate.insert(MongoTemplate.java:989)
	at org.springframework.data.mongodb.repository.support.SimpleMongoRepository.insert(SimpleMongoRepository.java:247)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)

@Bean  
public MappingMongoConverter mappingMongoConverter(MongoDbFactory mongoDbFactory, MappingContext<? extends MongoPersistentEntity<?>, MongoPersistentProperty> mappingContext) throws Exception {  
    DbRefResolver dbRefResolver = new DefaultDbRefResolver(mongoDbFactory);  
  
  MappingMongoConverter converter = new MappingMongoConverter(dbRefResolver, mappingContext);  
  converter.setMapKeyDotReplacement("_");  
  converter.afterPropertiesSet();  
 return converter;  
}