Fix error when raw error is retrieved (#2079)

Fix error when raw error is retrieved (#2079)

changelog/fragments/1668434027-Accept-raw-errors-as-a-fallback-to-detailed-error-type.yaml

@@ -0,0 +1,31 @@
+# Kind can be one of:
+# - breaking-change: a change to previously-documented behavior
+# - deprecation: functionality that is being removed in a later release
+# - bug-fix: fixes a problem in a previous version
+# - enhancement: extends functionality but does not break or fix existing behavior
+# - feature: new functionality
+# - known-issue: problems that we are aware of in a given version
+# - security: impacts on the security of a product or a user’s deployment.
+# - upgrade: important information for someone upgrading from a prior version
+# - other: does not fit into any of the other categories
+kind: feature
+
+# Change summary; a 80ish characters long description of the change.
+summary: Accept raw errors as a fallback to detailed error type
+
+# Long description; in case the summary is not enough to describe the change
+# this field accommodate a description without length limits.
+#description:
+
+# Affected component; a word indicating the component this changeset affects.
+component:
+
+# PR number; optional; the PR number that added the changeset.
+# If not present is automatically filled by the tooling finding the PR where this changelog fragment has been added.
+# NOTE: the tooling supports backports, so it's able to fill the original PR number instead of the backport PR number.
+# Please provide it if you are adding a fragment for a different PR.
+pr: 2079
+
+# Issue number; optional; the GitHub issue related to this changeset (either closes or is part of).
+# If not present is automatically filled by the tooling with the issue linked to the PR number.
+issue: https://github.com/elastic/elastic-agent/issues/931

internal/pkg/bulk/helpers.go

@@ -30,7 +30,7 @@ func (u UpdateFields) Marshal() ([]byte, error) {
 func parseError(res *esapi.Response) error {
 
 	var e struct {
-		Err *es.ErrorT `json:"error"`
+		Err json.RawMessage `json:"error"`
 	}
 
 	decoder := json.NewDecoder(res.Body)

internal/pkg/bulk/schema.go

@@ -58,7 +58,7 @@ type BulkIndexerResponseItem struct {
 	//		Failed     int `json:"failed"`
 	//	} `json:"_shards"`
 
-	Error *es.ErrorT `json:"error,omitempty"`
+	Error json.RawMessage `json:"error,omitempty"`
 }
 
 func (b *BulkIndexerResponseItem) deriveError() error {
@@ -110,7 +110,7 @@ type MsearchResponseItem struct {
 	Hits         es.HitsT                  `json:"hits"`
 	Aggregations map[string]es.Aggregation `json:"aggregations,omitempty"`
 
-	Error *es.ErrorT `json:"error,omitempty"`
+	Error json.RawMessage `json:"error,omitempty"`
 }
 
 //easyjson:json