opensearchapi: revert node info OpensearchVersion type change

Signed-off-by: Jakob Hahn <[email protected]>

CHANGELOG.md

@@ -9,7 +9,6 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 ### Added
 - Added new struct fields introduced by opensearch 2.12 ([#482](https://github.com/opensearch-project/opensearch-go/pull/482))
 ### Changed
-- Changed field opensearch_version of type NodesInfoPlugin to json.RawMessage as opensearch 3.0.0 uses an array instead of string ([#482](https://github.com/opensearch-project/opensearch-go/pull/482))
 ### Deprecated
 ### Removed
 ### Fixed

opensearchapi/api_nodes-info.go

@@ -161,15 +161,15 @@ type NodesInfoHTTP struct {
 
 // NodesInfoPlugin is a sub type of NodesInfo containing information about a plugin
 type NodesInfoPlugin struct {
-	Name                string          `json:"name"`
-	Version             string          `json:"version"`
-	OpensearchVersion   json.RawMessage `json:"opensearch_version"`
-	JavaVersion         string          `json:"java_version"`
-	Description         string          `json:"description"`
-	Classname           string          `json:"classname"`
-	CustomFoldername    string          `json:"custom_foldername"`
-	ExtendedPlugins     []string        `json:"extended_plugins"`
-	HasNativeController bool            `json:"has_native_controller"`
+	Name                string   `json:"name"`
+	Version             string   `json:"version"`
+	OpensearchVersion   string   `json:"opensearch_version"`
+	JavaVersion         string   `json:"java_version"`
+	Description         string   `json:"description"`
+	Classname           string   `json:"classname"`
+	CustomFoldername    string   `json:"custom_foldername"`
+	ExtendedPlugins     []string `json:"extended_plugins"`
+	HasNativeController bool     `json:"has_native_controller"`
 }
 
 // NodesInfoIngest is a sub type of NodesInfo containing information about ingest processors