Fix the regression introduced in the OpenSearch OpenAPI spec (#1794) (#1824)

(cherry picked from commit c0d9c77)

Signed-off-by: Andriy Redko <drreta@gmail.com>
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: opensearch-trigger-bot[bot]

CHANGELOG.md

@@ -14,6 +14,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 
 ### Fixed
 - Fixed an issue where `AwsSdk2Transport` would create a default `JacksonJsonpMapper` on every instantiation even if a mapper was already provided, which could cause issues with Jackson module resolution ([#1788](https://github.com/opensearch-project/opensearch-java/pull/1788))
+- Fixed the regression introduced in the OpenSearch OpenAPI spec ([#1794](https://github.com/opensearch-project/opensearch-java/pull/1794))
 
 ### Security
 

java-client/src/generated/java/org/opensearch/client/opensearch/_types/aggregations/Aggregation.java

@@ -159,16 +159,21 @@ public final AggregationVariant _get() {
         return _value;
     }
 
+    @Nonnull
+    private final Map<String, Aggregation> aggregations;
+
     @Nonnull
     private final Map<String, JsonData> meta;
 
     public Aggregation(AggregationVariant value) {
         this._kind = ApiTypeHelper.requireNonNull(value._aggregationKind(), this, "<variant kind>");
         this._value = ApiTypeHelper.requireNonNull(value, this, "<variant value>");
+        this.aggregations = null;
         this.meta = null;
     }
 
     private Aggregation(Builder builder) {
+        this.aggregations = ApiTypeHelper.unmodifiable(builder.aggregations);
         this.meta = ApiTypeHelper.unmodifiable(builder.meta);
         this._kind = ApiTypeHelper.requireNonNull(builder._kind, builder, "<variant kind>");
         this._value = ApiTypeHelper.requireNonNull(builder._value, builder, "<variant value>");
@@ -178,6 +183,17 @@ public static Aggregation of(Function<Aggregation.Builder, ObjectBuilder<Aggrega
         return fn.apply(new Builder()).build();
     }
 
+    /**
+     * Sub-aggregations for this aggregation. Only applies to bucket aggregations.
+     * <p>
+     * API name: {@code aggregations}
+     * </p>
+     */
+    @Nonnull
+    public final Map<String, Aggregation> aggregations() {
+        return this.aggregations;
+    }
+
     /**
      * API name: {@code meta}
      */
@@ -1229,6 +1245,16 @@ public WeightedAverageAggregation weightedAvg() {
     @Override
     public void serialize(JsonGenerator generator, JsonpMapper mapper) {
         generator.writeStartObject();
+        if (ApiTypeHelper.isDefined(this.aggregations)) {
+            generator.writeKey("aggregations");
+            generator.writeStartObject();
+            for (Map.Entry<String, Aggregation> item0 : this.aggregations.entrySet()) {
+                generator.writeKey(item0.getKey());
+                item0.getValue().serialize(generator, mapper);
+            }
+            generator.writeEnd();
+        }
+
         if (ApiTypeHelper.isDefined(this.meta)) {
             generator.writeKey("meta");
             generator.writeStartObject();
@@ -1259,16 +1285,66 @@ public static class Builder extends ObjectBuilderBase {
         private Kind _kind;
         private AggregationVariant _value;
         @Nullable
+        private Map<String, Aggregation> aggregations;
+        @Nullable
         private Map<String, JsonData> meta;
 
         public Builder() {}
 
         private Builder(Aggregation o) {
+            this.aggregations = _mapCopy(o.aggregations);
             this.meta = _mapCopy(o.meta);
             this._kind = o._kind;
             this._value = o._value;
         }
 
+        /**
+         * Sub-aggregations for this aggregation. Only applies to bucket aggregations.
+         * <p>
+         * API name: {@code aggregations}
+         * </p>
+         *
+         * <p>
+         * Adds all elements of <code>map</code> to <code>aggregations</code>.
+         * </p>
+         */
+        @Nonnull
+        public final Builder aggregations(Map<String, Aggregation> map) {
+            this.aggregations = _mapPutAll(this.aggregations, map);
+            return this;
+        }
+
+        /**
+         * Sub-aggregations for this aggregation. Only applies to bucket aggregations.
+         * <p>
+         * API name: {@code aggregations}
+         * </p>
+         *
+         * <p>
+         * Adds an entry to <code>aggregations</code>.
+         * </p>
+         */
+        @Nonnull
+        public final Builder aggregations(String key, Aggregation value) {
+            this.aggregations = _mapPut(this.aggregations, key, value);
+            return this;
+        }
+
+        /**
+         * Sub-aggregations for this aggregation. Only applies to bucket aggregations.
+         * <p>
+         * API name: {@code aggregations}
+         * </p>
+         *
+         * <p>
+         * Adds a value to <code>aggregations</code> using a builder lambda.
+         * </p>
+         */
+        @Nonnull
+        public final Builder aggregations(String key, Function<Aggregation.Builder, ObjectBuilder<Aggregation>> fn) {
+            return aggregations(key, fn.apply(new Aggregation.Builder()).build());
+        }
+
         /**
          * API name: {@code meta}
          *
@@ -1979,6 +2055,53 @@ protected Aggregation build() {
         public class ContainerBuilder implements ObjectBuilder<Aggregation> {
             private ContainerBuilder() {}
 
+            /**
+             * Sub-aggregations for this aggregation. Only applies to bucket aggregations.
+             * <p>
+             * API name: {@code aggregations}
+             * </p>
+             *
+             * <p>
+             * Adds all elements of <code>map</code> to <code>aggregations</code>.
+             * </p>
+             */
+            @Nonnull
+            public final ContainerBuilder aggregations(Map<String, Aggregation> map) {
+                Builder.this.aggregations = _mapPutAll(Builder.this.aggregations, map);
+                return this;
+            }
+
+            /**
+             * Sub-aggregations for this aggregation. Only applies to bucket aggregations.
+             * <p>
+             * API name: {@code aggregations}
+             * </p>
+             *
+             * <p>
+             * Adds an entry to <code>aggregations</code>.
+             * </p>
+             */
+            @Nonnull
+            public final ContainerBuilder aggregations(String key, Aggregation value) {
+                Builder.this.aggregations = _mapPut(Builder.this.aggregations, key, value);
+                return this;
+            }
+
+            /**
+             * Sub-aggregations for this aggregation. Only applies to bucket aggregations.
+             * <p>
+             * API name: {@code aggregations}
+             * </p>
+             *
+             * <p>
+             * Adds a value to <code>aggregations</code> using a builder lambda.
+             * </p>
+             */
+            @Nonnull
+            public final ContainerBuilder aggregations(String key, Function<Aggregation.Builder, ObjectBuilder<Aggregation>> fn) {
+                return aggregations(key, fn.apply(new Aggregation.Builder()).build());
+            }
+
             /**
              * API name: {@code meta}
              *
@@ -2013,6 +2136,7 @@ public Aggregation build() {
     }
 
     protected static void setupAggregationDeserializer(ObjectDeserializer<Builder> op) {
+        op.add(Builder::aggregations, JsonpDeserializer.stringMapDeserializer(Aggregation._DESERIALIZER), "aggregations", "aggs");
         op.add(Builder::meta, JsonpDeserializer.stringMapDeserializer(JsonData._DESERIALIZER), "meta");
         op.add(Builder::adjacencyMatrix, AdjacencyMatrixAggregation._DESERIALIZER, "adjacency_matrix");
         op.add(Builder::autoDateHistogram, AutoDateHistogramAggregation._DESERIALIZER, "auto_date_histogram");
@@ -2092,6 +2216,7 @@ public int hashCode() {
         int result = 17;
         result = 31 * result + Objects.hashCode(this._kind);
         result = 31 * result + Objects.hashCode(this._value);
+        result = 31 * result + Objects.hashCode(this.aggregations);
         result = 31 * result + Objects.hashCode(this.meta);
         return result;
     }
@@ -2103,6 +2228,7 @@ public boolean equals(Object o) {
         Aggregation other = (Aggregation) o;
         return Objects.equals(this._kind, other._kind)
             && Objects.equals(this._value, other._value)
+            && Objects.equals(this.aggregations, other.aggregations)
             && Objects.equals(this.meta, other.meta);
     }
 }