Single-property index in `index.yaml` causes deployment failure

[iZUMi-kyouka]

• Environment: V9-clean-slate-sql

Steps to reproduce

• ./gradlew appEngineDeployAll

Expected behaviour

• Deployment succeeds

Actual behaviour

• Deployment fails with

ERROR: (gcloud.app.deploy) INVALID_ARGUMENT: This index:
CREATE SPARSE(ALL) DATASTORE INDEX ON Instructor (googleId ASC);
is not necessary, since single-property indexes are built in. Please remove it from your index file and upgrade to the latest version of the SDK, if you haven't already.

with reasons stated in the error

Solution

- kind: Instructor
  properties:
  - direction: asc
    name: googleId

These lines should be removed (previously it is also indexing the isArchived property)