Fix nodes stats API compatibility with OpenSearch 3.3.0+

Add missing fields to nodes stats API structs for OpenSearch 3.3.0+
compatibility:

- Add NeuralSearch field to NodesStatsBreakers struct for neural
  search circuit breaker support
- Add QueryFailed and StartreeQueryFailed fields to search stats
  for tracking failed queries
- Add SystemGeneratedProcessors and SystemGeneratedFactories fields
  to NodesStatsSearchPipeline for search pipeline system components

Fixes test failures where these fields were being dropped during JSON
unmarshalling, causing jsondiff mismatches in OpenSearch 3.3.0+.

Signed-off-by: Sean Chittenden <sean.chittenden@crowdstrike.com>

Author: sean-

CHANGELOG.md

@@ -20,6 +20,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Fix cat APIs compatibility with OpenSearch 3.2.0+ by adding indexing timestamp and startree query fields
 - Fix floating point precision loss in nodes stats concurrent_avg_slice_count field by changing from float32 to float64
 - Fix security plugin health API compatibility with OpenSearch 3.2.0+ by adding settings field
+- Fix nodes stats API compatibility with OpenSearch 3.3.0+ by adding neural_search breaker, query_failed and startree_query_failed search fields, and search pipeline system_generated fields
 
 ### Security
 

opensearchapi/api_nodes-stats.go

@@ -154,13 +154,15 @@ type NodesStatsIndices struct {
 		QueryTotal                  int     `json:"query_total"`
 		QueryTimeInMillis           int     `json:"query_time_in_millis"`
 		QueryCurrent                int     `json:"query_current"`
+		QueryFailed                 int     `json:"query_failed"` // Available in OpenSearch 3.3.0+
 		ConcurrentQueryTotal        int     `json:"concurrent_query_total"`
 		ConcurrentQueryTimeInMillis int     `json:"concurrent_query_time_in_millis"`
 		ConcurrentQueryCurrent      int     `json:"concurrent_query_current"`
 		ConcurrentAVGSliceCount     float64 `json:"concurrent_avg_slice_count"`
 		StartreeQueryTotal          int     `json:"startree_query_total"`          // Available in OpenSearch 3.2.0+
 		StartreeQueryTimeInMillis   int     `json:"startree_query_time_in_millis"` // Available in OpenSearch 3.2.0+
 		StartreeQueryCurrent        int     `json:"startree_query_current"`        // Available in OpenSearch 3.2.0+
+		StartreeQueryFailed         int     `json:"startree_query_failed"`         // Available in OpenSearch 3.3.0+
 		FetchTotal                  int     `json:"fetch_total"`
 		FetchTimeInMillis           int     `json:"fetch_time_in_millis"`
 		FetchCurrent                int     `json:"fetch_current"`
@@ -494,6 +496,7 @@ type NodesStatsBreakers struct {
 	Fielddata        NodesStatsBreaker `json:"fielddata"`
 	InFlightRequests NodesStatsBreaker `json:"in_flight_requests"`
 	Parent           NodesStatsBreaker `json:"parent"`
+	NeuralSearch     NodesStatsBreaker `json:"neural_search"` // Available in OpenSearch 3.3.0+
 }
 
 // NodesStatsScript is a sub type of NodesStats representing script information of the node
@@ -679,7 +682,9 @@ type NodesStatsSearchPipeline struct {
 		Current      int `json:"current"`
 		Failed       int `json:"failed"`
 	} `json:"total_response"`
-	Pipelines json.RawMessage `json:"pipelines"`
+	Pipelines                 json.RawMessage `json:"pipelines"`
+	SystemGeneratedProcessors json.RawMessage `json:"system_generated_processors"` // Available in OpenSearch 3.3.0+
+	SystemGeneratedFactories  json.RawMessage `json:"system_generated_factories"`  // Available in OpenSearch 3.3.0+
 }
 
 // NodesStatsTaskCancellation is a sub type of NodesStats containing stats about canceled tasks