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add known issue to elasticsearch exporter readme #43188

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14 changes: 14 additions & 0 deletions exporter/elasticsearchexporter/README.md
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Expand Up @@ -607,3 +607,17 @@ This may happen when you use [OTel mapping mode](#otel-mapping-mode) (the defaul

To resolve this, it is recommended to upgrade your Elasticsearch to 8.12+, ideally 8.16+.
Alternatively, try other mapping modes, but the document structure will be different.

### dropping cumulative temporarily histogram
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Suggested change
### dropping cumulative temporarily histogram
### "dropping cumulative temporality histogram" and "dropping cumulative temporality exponential histogram"

typo: temporality


Symptom: `elasticsearchexporter` logs a warning `dropping cumulative temporarily histogram` similar to:

```
warn [[email protected]](mailto:[email protected])/exporter.go:347 validation errors [service.name](https://service.name/): metrics error: dropping cumulative temporarily histogram http.client.request.duration
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incorrect formatting with hyperlinks. Can you reproduce an error and just copy from your terminal?

```

This issue occurs because Elasticsearch does not support **cumulative temporality** for histograms.
As a workaround, you can either:
- Export histogram metrics using **delta temporality**, or
- Apply a `cumulativetodelta` processor.
For more details, see [Metrics data ingestion](https://www.elastic.co/docs/reference/opentelemetry/compatibility/limitations#metrics-data-ingestion).
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