Use the newly introduced `MergeCtx` to propogate metadata keys in batch context

[lahsivjar]

Component(s)

exporter/elasticsearch

Is your feature request related to a problem? Please describe.

open-telemetry/opentelemetry-collector#13460 introduced MergeCtx in the batch settings to allow defining a custom merge function for the context which can be used to propagate metadata keys in batch context.

Describe the solution you'd like

As per open-telemetry/opentelemetry-collector#13460 (comment), we would eventually have metadata keys in the batch API and preserved in the batch context. However, in short term, we could use the MergeCtx to define a merge func to do the same.

Describe alternatives you've considered

No response

Additional context

No response

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[lahsivjar]

/label -needs-triage

[github-actions]

Pinging code owners:

• exporter/elasticsearch: @JaredTan95 @carsonip @lahsivjar

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• exporter/elasticsearchexporter: @JaredTan95 @carsonip @lahsivjar

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[lahsivjar]

Still relevant. Now that open-telemetry/opentelemetry-collector#13742 is meged we can proceed with using MergeCtx.

[carsonip]

/label -stale