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Mar 18, 2025
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Document changes in partial result reporting #124928

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Document changes in partial result reporting
smalyshev Mar 14, 2025
a3d1f7d
Move allow_partial_results to query params
smalyshev Mar 14, 2025
1a0123c
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smalyshev Mar 17, 2025
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3 changes: 2 additions & 1 deletion docs/reference/esql/esql-across-clusters.asciidoc
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Expand Up @@ -293,7 +293,8 @@ which clusters have slower response times than others.
skipped due to the can-match phase results. Shards are skipped when they cannot have any matching data
and therefore are not included in the full ES|QL query.
<7> The `is_partial` field is set to `true` if the search has partial results for any reason,
for example if it was interrupted before finishing using the <<esql-async-query-stop-api,async query stop API>>.
for example if it was interrupted before finishing using the <<esql-async-query-stop-api,async query stop API>>,
or one of the remotes or shards failed.


The cross-cluster metadata can be used to determine whether any data came back from a cluster.
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17 changes: 14 additions & 3 deletions docs/reference/esql/esql-query-api.asciidoc
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Expand Up @@ -63,6 +63,11 @@ You can also specify a format using the `Accept` HTTP header. If you specify
both this parameter and the `Accept` HTTP header, this parameter takes
precedence.

`allow_partial_results`::
(Optional, boolean) If `true`, partial results will be returned if there are shard failures, but
the query can continue to execute on other clusters and shards. This defaults to the value of
the setting `esql.query.allow_partial_results`.

[discrete]
[role="child_attributes"]
[[esql-query-api-request-body]]
Expand Down Expand Up @@ -120,11 +125,17 @@ returned if `drop_null_columns` is sent with the request.
(array of arrays)
Values for the search results.

`is_partial`::
(boolean)
Indicates whether the response is partial. Partial responses can happen due to failures in remote clusters
or single shards, or stopping an async query.

`_clusters`::
(object)
Metadata about clusters involved in the execution of a cross-cluster query. Only returned (1) for
cross-cluster searches and (2) when `include_ccs_metadata` is sent in the body and set to `true`
and (3) when `format` of the response is set to JSON (the default), CBOR, SMILE, or YAML.
Metadata about clusters involved in the execution of a query. This field is present in the response in the following cases:
(1) for cross-cluster searches, when `include_ccs_metadata` is sent in the body and set to `true`;
(2) the result is partial (`is_partial` is `true`) and there are failures on some clusters.
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Question: if all shards were successful in the local cluster, will the _clusters be included in the response if remotes have partial shard failures even if include_ccs_metadata is false?

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Yes, if there are any failures that make the response partial, then _clusters will be included together with the failures.

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Question: metadata would be present if the query is stopped, right?

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No, unless there are any failures, it's one of 1) include_ccs_metadata + CSS; or 2) partial + failures. If there are no failures to report then 2) is not activated.

It is only returned if the `format` of the response is set to JSON (the default), CBOR, SMILE, or YAML.
See <<ccq-cluster-details>> for more information.

`profile`::
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