Clean up code in IndexBackfiller

[cherylEnkidu]

#no-changelog

[github-actions]

Unit Test Results

0 tests  ±0   0 ✔️ ±0   0s ⏱️ ±0s
0 suites ±0   0 💤 ±0 
0 files   ±0   0 ❌ ±0 

Results for commit 5e7746a. ± Comparison against base commit 4bd380f.

♻️ This comment has been updated with latest results.

[google-oss-bot]

Coverage Report ¹

Affected Products

• firebase-firestore

  Overall coverage changed from 45.91% (4bd380f) to 45.87% (9f4f7ac) by -0.04%.

  Filename	Base (4bd380f)	Merge (9f4f7ac)	Diff
  DeleteMutation.java	90.48%	95.24%	+4.76%
  GrpcCallProvider.java	62.35%	51.76%	-10.59%
  PatchMutation.java	100.00%	98.39%	-1.61%

Test Logs

• Base (4bd380f): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-check-coverage/1554499159778660352
• Merge (9f4f7ac): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3959/check-coverage-changed/1554520797966503941

Notes

• Commit (9f4f7ac) is created by Prow via merging PR base commit (4bd380f) and head commit (5e7746a).
• Run gradle <product>:checkCoverage to produce HTML coverage reports locally. After gradle commands finished, report files can be found under <product-build-dir>/reports/jacoco/.

1. https://storage.googleapis.com/firebase-sdk-metric-reports/FmTDLySBZl.html

[google-oss-bot]

Size Report ¹

Affected Products

No changes between base commit (4bd380f) and merge commit (d5b9a79).

Test Logs

• Base (4bd380f): https://android-ci.firebaseopensource.com/view/gcs/android-ci/logs/postsubmit-binary-size/1554499159791243264
• Merge (d5b9a79): https://android-ci.firebaseopensource.com/view/gcs/android-ci/pr-logs/pull/firebase_firebase-android-sdk/3959/binary-size/1554519411543511043

Notes

• Commit (d5b9a79) is created by Prow via merging PR base commit (4bd380f) and head commit (e1bb34c).

1. https://storage.googleapis.com/firebase-sdk-metric-reports/rf1f2s2wRl.html

[google-oss-bot]

@cherylEnkidu: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
smoke-tests	5e7746a	link	/test smoke-tests

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