Connect spring boot and mongodb on different kubernetes pods

Question

I am trying to create two different deployments using kubernetes, one for a spring boot project and another one for mongo db. I want the spring boot project to connect to mongo. Here is my properties file:

server:
  port: 8081

spring:
  data:
    mongodb:
      host: mongo-service
      port: 27017
      database: inventory

And here is the .yml file I am using for kubernetes:

apiVersion: apps/v1
kind: Deployment
metadata:
  name: inventory
  labels:
    app: inventory
spec:
  selector:
    matchLabels:
      app: inventory
  template:
    metadata:
      labels:
        app: inventory
    spec:
      containers:
      - image: carlospalma03/inventory_java-api:version7
        name: inventory-api
        ports:
        - containerPort: 8081
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mongo
  labels:
    app: mongo
spec:
  selector:
    matchLabels:
      app: mongo
  template:
    metadata:
      labels:
        app: mongo
    spec:
      containers:
      - image: mongo
        name: mongo-db
        ports:
        - containerPort: 27017

---
apiVersion: v1
kind: Service
metadata:
  name: mongo-service
  labels:
    run: mongo-service
spec:
  ports:
    - port: 27017
      protocol: TCP
  selector:
    app: mongo-service

I get the following exception on the spring boot side:

Exception in monitor thread while connecting to server mongo-db:27017

Does anybody know what's the proper name I should use for the mongo-db service so that the spring boot project can communicate with it?

I am trying to use the name of the kubernetes service I created to enable communication but something tells me that there's a trick to how spring boot names the other pods.