Datastore emulator fails to start without project id property #355

Environment details

1. GCloud datastore emulator 2.1.0
2. Google Cloud SDK 327.0.0
3. OS type and version: NAME="Ubuntu" VERSION="18.04.4 LTS (Bionic Beaver)" / MacOS Catalina 10.15.7 (19H15)
4. Java version: OpenJDK Runtime Environment AdoptOpenJDK (build 11.0.8+10) / OpenJDK Runtime Environment (build 11.0.7+10)
5. Libs:

• https://github.com/GoogleCloudPlatform/spring-cloud-gcp: org.springframework.cloud:spring-cloud-gcp-starter-data-datastore:1.2.5.RELEASE, I checked - same with the latest
• google-cloud-datastore:1.104.0
• google-cloud-core:1.93.7

Steps to reproduce

This version emulator fails to start without --project property

1. gcloud beta emulators datastore start

ERROR: (gcloud.beta.emulators.datastore.start) The required property [project] is not currently set.
You may set it for your current workspace by running:

  $ gcloud config set project VALUE

or it can be set temporarily by the environment variable [CLOUDSDK_CORE_PROJECT]

Starting emulator with Java code like this:

LocalDatastoreHelper.create(settings.getConsistency(), settings.getPort());

Causes: no messages in logs, the application failed to call the Datastore then with I/O exceptions, i.e. curl doesn't work.

Workaround

Set env variable: CLOUDSDK_CORE_PROJECT with the projectId value

Questions

1. Why LocalDatastoreHelper doesn't pass --project on startup and doesn't expect this from the builder?
2. Shouldn't LocalDatastoreHelper #start fail to start on this kind of errors?

Besides the outcomes of these questions, I would expect this class to fail to start or log something.