Spanner: should create a storing index in an example table failed

[flaky-bot]

This test failed!

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commit: b1c530b
buildURL: Build Status, Sponge
status: failed

Test output

expected 'Waiting for operation to complete...\n' to match /Added the AlbumsByAlbumTitle2 index\./
AssertionError: expected 'Waiting for operation to complete...\n' to match /Added the AlbumsByAlbumTitle2 index\./
    at Context. (system-test/spanner.test.js:454:12)

[flaky-bot]

Looks like this issue is flaky. 😟

I'm going to leave this open and stop commenting.

A human should fix and close this.

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When run at the same commit (b1c530b), this test passed in one build (Build Status, Sponge) and failed in another build (Build Status, Sponge).