Fix cat APIs compatibility with OpenSearch 3.2.0+

OpenSearch 3.2.0 introduced new fields in the cat APIs (indices, nodes, shards)
that were being dropped during JSON marshalling/unmarshalling. This resulted in
test failures when comparing raw JSON with parsed JSON.

Added missing fields to CatIndexResp, CatNodesItemResp, and CatShardResp structs:
- LastIndexRequestTimestamp and LastIndexRequestTimestampString in indices API
- SearchStartreeQueryCurrent, SearchStartreeQueryTime, SearchStartreeQueryTotal in search stats
- PrimaryStartreeQueryCurrent, PrimaryStartreeQueryTime, PrimaryStartreeQueryTotal in primary search stats (indices only)

These fields are always present in OpenSearch 3.2.0+ cat API responses and should be
preserved without omitempty tags since they contain legitimate zero values.

This complements the similar fixes made to the nodes stats and indices stats APIs
and ensures full cat API compatibility with OpenSearch 3.2.0+.

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

Author: sean-

CHANGELOG.md

@@ -17,6 +17,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Fix nodes API compatibility with OpenSearch 3.1.0+ by adding phase_results_processors field
 - Fix nodes stats API compatibility with OpenSearch 3.2.0+ by adding max_last_index_request_timestamp and startree query fields
 - Fix indices stats API compatibility with OpenSearch 3.2.0+ by adding max_last_index_request_timestamp and startree query fields
+- Fix cat APIs compatibility with OpenSearch 3.2.0+ by adding indexing timestamp and startree query fields
 
 ### Security
 

opensearchapi/api_cat-indices.go

@@ -156,6 +156,12 @@ type CatIndexResp struct {
 	PrimarySearchConcurrentQueryTotal    *int    `json:"pri.search.concurrent_query_total,string"`
 	SearchConcurrentAvgSliceCount        *string `json:"search.concurrent_avg_slice_count"`
 	PrimarySearchConcurrentAvgSliceCount *string `json:"pri.search.concurrent_avg_slice_count"`
+	SearchStartreeQueryCurrent           *int    `json:"search.startree_query_current,string"` // Available in OpenSearch 3.2.0+
+	PrimaryStartreeQueryCurrent          *int    `json:"pri.startree.query_current,string"`    // Available in OpenSearch 3.2.0+
+	SearchStartreeQueryTime              *string `json:"search.startree_query_time"`           // Available in OpenSearch 3.2.0+
+	PrimaryStartreeQueryTime             *string `json:"pri.startree.query_time"`              // Available in OpenSearch 3.2.0+
+	SearchStartreeQueryTotal             *string `json:"search.startree_query_total"`          // Available in OpenSearch 3.2.0+
+	PrimaryStartreeQueryTotal            *string `json:"pri.startree.query_total"`             // Available in OpenSearch 3.2.0+
 	SearchScrollCurrent                  *int    `json:"search.scroll_current,string"`
 	PrimarySearchScrollCurrent           *int    `json:"pri.search.scroll_current,string"`
 	SearchScrollTime                     *string `json:"search.scroll_time"`
@@ -193,6 +199,8 @@ type CatIndexResp struct {
 	MemoryTotal                          string  `json:"memory.total"`
 	PrimaryMemoryTotal                   string  `json:"pri.memory.total"`
 	SearchThrottled                      bool    `json:"search.throttled,string"`
+	LastIndexRequestTimestamp            *string `json:"last_index_request_timestamp"`        // Available in OpenSearch 3.2.0+
+	LastIndexRequestTimestampString      *string `json:"last_index_request_timestamp_string"` // Available in OpenSearch 3.2.0+
 }
 
 // Inspect returns the Inspect type containing the raw *opensearch.Response

opensearchapi/api_cat-nodes.go

@@ -122,6 +122,9 @@ type CatNodesItemResp struct {
 	SearchConcurrentQueryTime       *string `json:"search.concurrent_query_time"`
 	SearchConcurrentQueryTotal      *int    `json:"search.concurrent_query_total,string"`
 	SearchConcurrentAvgSliceCount   *string `json:"search.concurrent_avg_slice_count"`
+	SearchStartreeQueryCurrent      *int    `json:"search.startree_query_current,string"` // Available in OpenSearch 3.2.0+
+	SearchStartreeQueryTime         *string `json:"search.startree_query_time"`           // Available in OpenSearch 3.2.0+
+	SearchStartreeQueryTotal        *int    `json:"search.startree_query_total,string"`   // Available in OpenSearch 3.2.0+
 	SearchScrollCurrent             *int    `json:"search.scroll_current,string"`
 	SearchScrollTime                *string `json:"search.scroll_time"`
 	SearchScrollTotal               *int    `json:"search.scroll_total,string"`

opensearchapi/api_cat-shards.go

@@ -106,6 +106,9 @@ type CatShardResp struct {
 	SearchConcurrentQueryTime      *string `json:"search.concurrent_query_time"`
 	SearchConcurrentQueryTotal     *int    `json:"search.concurrent_query_total,string"`
 	SearchConcurrentAvgSliceCount  *string `json:"search.concurrent_avg_slice_count"`
+	SearchStartreeQueryCurrent     *int    `json:"search.startree_query_current,string"` // Available in OpenSearch 3.2.0+
+	SearchStartreeQueryTime        *string `json:"search.startree_query_time"`           // Available in OpenSearch 3.2.0+
+	SearchStartreeQueryTotal       *int    `json:"search.startree_query_total,string"`   // Available in OpenSearch 3.2.0+
 	SearchScrollCurrent            *int    `json:"search.scroll_current,string"`
 	SearchScrollTime               *string `json:"search.scroll_time"`
 	SearchScrollTotal              *int    `json:"search.scroll_total,string"`