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Document the X-Opaque-Id header #8820

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15 changes: 14 additions & 1 deletion _api-reference/common-parameters.md
Original file line number Diff line number Diff line change
Expand Up @@ -123,4 +123,17 @@ Kilometers | `km` or `kilometers`
Meters | `m` or `meters`
Centimeters | `cm` or `centimeters`
Millimeters | `mm` or `millimeters`
Nautical miles | `NM`, `nmi`, or `nauticalmiles`
Nautical miles | `NM`, `nmi`, or `nauticalmiles`

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## `X-Opaque-Id` Header

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You can specify an opaque identifier on any request using the `X-Opaque-Id` header. This identifier is used to track tasks and deduplicate deprecation warnings in server side logs. This identifier is intended to differentiate callers sending requests to your OpenSearch cluster. Do not specify a unique value per request.

#### Example request

The following request adds an opaque ID to the request:

```json
curl -H "X-Opaque-Id: my-curl-client-1" -XGET localhost:9200/_tasks
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```
{% include copy.html %}
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