count queries using aggregate api: "after each" hook for "counts multiple documents with filter" failed

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---

commit: 7a9d17b
buildURL: Build Status, Sponge
status: failed

Test output

Firestore has 1 unfinished operations executing.
/tmpfs/src/github/nodejs-firestore/dev/test/util/helpers.ts:105
            new Error(
            ^
Error: Firestore has 1 unfinished operations executing.

at Timeout._onTimeout (dev/test/util/helpers.ts:105:13)

at listOnTimeout (internal/timers.js:557:17)

at processTimers (internal/timers.js:500:7)