[receiver/elasticsearch]: Add node version as a resource attribute

[davidji99]

#16847

Add elasticsearch.node.version to all elasticsearch metrics.

[runforesight]

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build-and-test-windows duration(4 seconds) has decreased 46 minutes 52 seconds compared to main branch avg(46 minutes 56 seconds).

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⭕  build-and-test-windows workflow has finished in 4 seconds (46 minutes 52 seconds less than main branch avg.) and finished at 3rd Jan, 2023.

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✅  tracegen workflow has finished in 1 minute 7 seconds (3 minutes 23 seconds less than main branch avg.) and finished at 3rd Jan, 2023.

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✅  check-links workflow has finished in 1 minute 30 seconds (2 minutes 31 seconds less than main branch avg.) and finished at 3rd Jan, 2023.

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✅  build-and-test workflow has finished in 37 minutes (23 minutes 15 seconds less than main branch avg.) and finished at 3rd Jan, 2023.

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Job	Failed Steps	Tests
unittest-matrix (1.19, internal)	-     🔗	✅ 595  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, internal)	-     🔗	✅ 595  ❌ 0  ⏭ 0    🔗	See Details
correctness-traces	-     🔗	✅ 17  ❌ 0  ⏭ 0    🔗	See Details
correctness-metrics	-     🔗	✅ 2  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, extension)	-     🔗	✅ 528  ❌ 0  ⏭ 0    🔗	See Details
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unittest-matrix (1.19, processor)	-     🔗	✅ 1476  ❌ 0  ⏭ 0    🔗	See Details
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unittest-matrix (1.19, receiver-0)	-     🔗	✅ 2563  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.18, receiver-0)	-     🔗	✅ 2563  ❌ 0  ⏭ 0    🔗	See Details
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unittest-matrix (1.18, receiver-1)	-     🔗	✅ 1886  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, exporter)	-     🔗	✅ 2450  ❌ 0  ⏭ 0    🔗	See Details
unittest-matrix (1.19, receiver-1)	-     🔗	✅ 1886  ❌ 0  ⏭ 0    🔗	See Details
integration-tests	-     🔗	✅ 55  ❌ 0  ⏭ 0    🔗	See Details
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✅  load-tests workflow has finished in 8 minutes 9 seconds (10 minutes 29 seconds less than main branch avg.) and finished at 3rd Jan, 2023.

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Job	Failed Steps	Tests
loadtest (TestTraceAttributesProcessor)	-     🔗	✅ 3  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestIdleMode)	-     🔗	✅ 1  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetric10kDPS|TestMetricsFromFile)	-     🔗	✅ 6  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceNoBackend10kSPS|TestTrace1kSPSWithAttrs)	-     🔗	✅ 8  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestTraceBallast1kSPSWithAttrs|TestTraceBallast1kSPSAddAttrs)	-     🔗	✅ 10  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestMetricResourceProcessor|TestTrace10kSPS)	-     🔗	✅ 12  ❌ 0  ⏭ 0    🔗	See Details
loadtest (TestBallastMemory|TestLog10kDPS)	-     🔗	✅ 19  ❌ 0  ⏭ 0    🔗	See Details
setup-environment	-     🔗	N/A	See Details

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[djaglowski]

This seems like a reasonable attribute to add, but I'm not sure how it relates to the tracking issue you linked.

More importantly, this will be considered a breaking change, so needs to go behind a feature gate: https://github.com/open-telemetry/opentelemetry-collector/blob/main/docs/scraping-receivers.md#other-changes

[davidji99]

Added the new resource attribute behind a gate @djaglowski

Build is failing due to #16846

[davidji99]

@djaglowski

In addressing #16831 (comment), I realized node version is not returned by the /nodes/_stats endpoint but rather /nodes endpoint. So, I've updated the code and tests to reflect this additional API call. Please review.

[davidji99]

Updated @djaglowski

[davidji99]

Updated @djaglowski

[davidji99]

@djaglowski review again when you can.

[djaglowski]

Please rebase

[djaglowski]

Unfortunately, we'll need another rebase due to a test failure on main.

[davidji99]

@djaglowski Updated.