mongod --auth --config mongod.conf --dbpath=datamongo4

db.createUser(
  {
    user: "us1",
    pwd: "abc123",
    roles: [ { role: "readWrite", db: "dbTest" }]
  }
)

db.createUser(
  {
    user: "us2",
    pwd: "abc123",
    roles: [
        { role: "userAdminAnyDatabase", db: "admin" },
        { role: "root", db: "admin" },
        { role: "readWrite", db: "dbTest" }
    ]
  }
)

spring.data.mongodb.host=localhost
spring.data.mongodb.port=27017
spring.data.mongodb.database=dbTest
spring.data.mongodb.username=user
spring.data.mongodb.password=pass
spring.data.mongodb.authentication-database=dbTest

org.springframework.data.mongodb.UncategorizedMongoDbException: Query failed with error code 13 and error message 'command find requires authentication' on server localhost:27017; nested exception is com.mongodb.MongoQueryException: Query failed with error code 13 and error message 'command find requires authentication' on server localhost:27017