how to define mongo index in spring boot code example
Example: mongodb spring boot index usage 0
MongoDatabaseFactory dbFactory = new SimpleMongoClientDatabaseFactory(...);
DefaultDbRefResolver dbRefResolver = new DefaultDbRefResolver(dbFactory);
MongoMappingContext mappingContext = new MongoMappingContext();
mappingContext.setAutoIndexCreation(true);
// ...
mappingContext.afterPropertiesSet();
MongoTemplate template = new MongoTemplate(dbFactory, new MappingMongoConverter(dbRefResolver, mappingContext));