[7.x] Only add data_streams.* fields when enabled (#4461)

[jalvz]

Backports the following commits to 7.x:

• Only add data_streams.* fields when enabled (Only add data_stream.* fields when enabled #4461)

[apmmachine]

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Build stats

• Build Cause: Pull request #4521 updated

• Start Time: 2020-12-14T08:45:39.331+0000

• Duration: 29 min 33 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4507
Skipped	140
Total	4647

Steps errors

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Compress

• Took 0 min 0 sec . View more details on here
• Description: tar --exclude=coverage-files.tgz -czf coverage-files.tgz coverage

Compress

• Took 0 min 0 sec . View more details on here
• Description: tar --exclude=system-tests-linux-files.tgz -czf system-tests-linux-files.tgz system-tests

Test Sync

• Took 3 min 53 sec . View more details on here
• Description: ./script/jenkins/sync.sh

[codecov-io]

Codecov Report

Merging #4521 (6a0dbe5) into 7.x (85b27f9) will decrease coverage by 0.03%.
The diff coverage is 93.33%.

@@            Coverage Diff             @@
##              7.x    #4521      +/-   ##
==========================================
- Coverage   76.18%   76.14%   -0.04%     
==========================================
  Files         158      158              
  Lines        9783     9777       -6     
==========================================
- Hits         7453     7445       -8     
- Misses       2330     2332       +2     

Impacted Files	Coverage Δ
publish/pub.go	73.80% <0.00%> (-2.10%)	⬇️
beater/beater.go	61.65% <100.00%> (-1.63%)	⬇️
model/error.go	98.60% <100.00%> (+<0.01%)	⬆️
model/metricset.go	94.91% <100.00%> (+0.08%)	⬆️
model/profile.go	100.00% <100.00%> (ø)
model/span.go	93.25% <100.00%> (+0.07%)	⬆️
model/transaction.go	85.18% <100.00%> (+0.27%)	⬆️
processor/otel/consumer.go	93.58% <0.00%> (-0.45%)	⬇️
...ack/apm-server/aggregation/txmetrics/aggregator.go	93.36% <0.00%> (ø)