Temporary Failure in Name Resolution When Running Spring App with Dockerized Mongodb

I have simple SpringBoot app with following configuration, running on Ubuntu 20.04

pom.xml

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.7.4</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

....

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

And in application.properties spring.data.mongodb.uri=mongodb://my_db:27017/test

I'm not sure if that is relevant but I have some documents as well

@Repository
interface SomeDocumentRepository : CrudRepository<SomeDocument, String>

@Document
data class SomeDocument(
    @Id val id: String? = null,
    val name: String
)

And I'm running Mongo in docker container by executing docker run -d -p 27017:27017 --name my_db mongo:latest

However, when I start my Spring application, it crashes with com.mongodb.MongoSocketException: my_db: Temporary failure in name resolution

Any idea what is wrong with that configuration? Why is it failing?