Preprocessing - Add filter to not convert additionalProperties when only one key allowed (opensearch-project#292)

Signed-off-by: xil <fridalu66@gmail.com>

Author: lucy66hw

CHANGELOG.md

@@ -9,6 +9,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Add terms aggregation protos  ([#268](https://github.com/opensearch-project/opensearch-protobufs/pull/268))
 - Preprocessing: Handle unnamed additionalProperties.([#272](https://github.com/opensearch-project/opensearch-protobufs/pull/272))
 - Support importing without proto file name knowledge in Python generated protobuf code ([#275](https://github.com/opensearch-project/opensearch-protobufs/pull/275))
+- Preprocessing - Add filter to not convert additionalProperties when only one key allowed ([#292](https://github.com/opensearch-project/opensearch-protobufs/pull/292))
 
 ### Changed
 - Update preprocessing for x-protobuf-excluded ([#266](https://github.com/opensearch-project/opensearch-protobufs/pull/266))

tools/proto-convert/src/SchemaModifier.ts

@@ -19,15 +19,14 @@ export class SchemaModifier {
         traverse(this.root, {
             onSchemaProperty: (schema) => {
                 this.deduplicateEnumValue(schema)
-                this.convertAdditionalPropertiesToProperty(schema, true)
                 this.handleAdditionalPropertiesUndefined(schema)
                 this.convertNullTypeToNullValue(schema)
                 this.collapseOrMergeOneOfArray(schema)
             },
             onSchema: (schema, schemaName) => {
                 if (!schema || isReferenceObject(schema)) return;
                 this.deduplicateEnumValue(schema)
-                this.convertAdditionalPropertiesToProperty(schema, false)
+                this.convertAdditionalPropertiesToProperty(schema)
                 this.handleAdditionalPropertiesUndefined(schema)
                 this.convertNullTypeToNullValue(schema)
                 this.handleOneOfConst(schema, schemaName)
@@ -351,7 +350,6 @@ export class SchemaModifier {
      * Converts additionalProperties with a title into a named property.
      *
      * @param schema - The schema to process
-     * @param isNestedProperty - If true, skip conversion (nested properties already have context)
      *
      * Example:
      *   Input:
@@ -381,14 +379,14 @@ export class SchemaModifier {
      *     minProperties: 2
      *   }
      **/
-    convertAdditionalPropertiesToProperty(schema: OpenAPIV3.SchemaObject, isNestedProperty: boolean = false): void {
+    convertAdditionalPropertiesToProperty(schema: OpenAPIV3.SchemaObject): void {
         if (!schema.additionalProperties || typeof schema.additionalProperties !== 'object') {
             return;
         }
 
         const additionalProps = schema.additionalProperties as any;
 
-        if (isNestedProperty) {
+        if (schema.minProperties === 1 && schema.maxProperties === 1) {
             return;
         }