diff --git a/CHANGELOG.md b/CHANGELOG.md
index f85eaecf7..e512cce14 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -23,6 +23,7 @@ Inspired from [Keep a Changelog](https://keepachangelog.com/en/1.0.0/)
 - Add document lifecycle guide and runnable sample ([#2017](https://github.com/opensearch-project/opensearch-java/pull/2017))
 
 ### Fixed
+- Fix `ShardFailure.shard` incorrectly marked required causing `MissingRequiredPropertyException` ([#2037](https://github.com/opensearch-project/opensearch-java/pull/2037))
 
 ## [Unreleased 3.x]
 ### Added
diff --git a/java-client/src/generated/java/org/opensearch/client/opensearch/_types/DerivedField.java b/java-client/src/generated/java/org/opensearch/client/opensearch/_types/DerivedField.java
index eb2e08155..41602d50a 100644
--- a/java-client/src/generated/java/org/opensearch/client/opensearch/_types/DerivedField.java
+++ b/java-client/src/generated/java/org/opensearch/client/opensearch/_types/DerivedField.java
@@ -68,9 +68,6 @@ public class DerivedField implements PlainJsonSerializable, ToCopyableBuilder<De
     @Nullable
     private final Boolean ignoreMalformed;
 
-    @Nonnull
-    private final String name;
-
     @Nullable
     private final String prefilterField;
 
@@ -88,7 +85,6 @@ public class DerivedField implements PlainJsonSerializable, ToCopyableBuilder<De
     private DerivedField(Builder builder) {
         this.format = builder.format;
         this.ignoreMalformed = builder.ignoreMalformed;
-        this.name = ApiTypeHelper.requireNonNull(builder.name, this, "name");
         this.prefilterField = builder.prefilterField;
         this.properties = ApiTypeHelper.unmodifiable(builder.properties);
         this.script = ApiTypeHelper.requireNonNull(builder.script, this, "script");
@@ -115,14 +111,6 @@ public final Boolean ignoreMalformed() {
         return this.ignoreMalformed;
     }
 
-    /**
-     * Required - API name: {@code name}
-     */
-    @Nonnull
-    public final String name() {
-        return this.name;
-    }
-
     /**
      * API name: {@code prefilter_field}
      */
@@ -176,9 +164,6 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
             generator.write(this.ignoreMalformed);
         }
 
-        generator.writeKey("name");
-        generator.write(this.name);
-
         if (this.prefilterField != null) {
             generator.writeKey("prefilter_field");
             generator.write(this.prefilterField);
@@ -222,7 +207,6 @@ public static class Builder extends ObjectBuilderBase implements CopyableBuilder
         private String format;
         @Nullable
         private Boolean ignoreMalformed;
-        private String name;
         @Nullable
         private String prefilterField;
         @Nullable
@@ -235,7 +219,6 @@ public Builder() {}
         private Builder(DerivedField o) {
             this.format = o.format;
             this.ignoreMalformed = o.ignoreMalformed;
-            this.name = o.name;
             this.prefilterField = o.prefilterField;
             this.properties = _mapCopy(o.properties);
             this.script = o.script;
@@ -245,7 +228,6 @@ private Builder(DerivedField o) {
         private Builder(Builder o) {
             this.format = o.format;
             this.ignoreMalformed = o.ignoreMalformed;
-            this.name = o.name;
             this.prefilterField = o.prefilterField;
             this.properties = _mapCopy(o.properties);
             this.script = o.script;
@@ -276,15 +258,6 @@ public final Builder ignoreMalformed(@Nullable Boolean value) {
             return this;
         }
 
-        /**
-         * Required - API name: {@code name}
-         */
-        @Nonnull
-        public final Builder name(String value) {
-            this.name = value;
-            return this;
-        }
-
         /**
          * API name: {@code prefilter_field}
          */
@@ -373,7 +346,6 @@ public DerivedField build() {
     protected static void setupDerivedFieldDeserializer(ObjectDeserializer<DerivedField.Builder> op) {
         op.add(Builder::format, JsonpDeserializer.stringDeserializer(), "format");
         op.add(Builder::ignoreMalformed, JsonpDeserializer.booleanDeserializer(), "ignore_malformed");
-        op.add(Builder::name, JsonpDeserializer.stringDeserializer(), "name");
         op.add(Builder::prefilterField, JsonpDeserializer.stringDeserializer(), "prefilter_field");
         op.add(Builder::properties, JsonpDeserializer.stringMapDeserializer(JsonData._DESERIALIZER), "properties");
         op.add(Builder::script, Script._DESERIALIZER, "script");
@@ -385,7 +357,6 @@ public int hashCode() {
         int result = 17;
         result = 31 * result + Objects.hashCode(this.format);
         result = 31 * result + Objects.hashCode(this.ignoreMalformed);
-        result = 31 * result + this.name.hashCode();
         result = 31 * result + Objects.hashCode(this.prefilterField);
         result = 31 * result + Objects.hashCode(this.properties);
         result = 31 * result + this.script.hashCode();
@@ -400,7 +371,6 @@ public boolean equals(Object o) {
         DerivedField other = (DerivedField) o;
         return Objects.equals(this.format, other.format)
             && Objects.equals(this.ignoreMalformed, other.ignoreMalformed)
-            && this.name.equals(other.name)
             && Objects.equals(this.prefilterField, other.prefilterField)
             && Objects.equals(this.properties, other.properties)
             && this.script.equals(other.script)
diff --git a/java-client/src/generated/java/org/opensearch/client/opensearch/_types/ShardFailure.java b/java-client/src/generated/java/org/opensearch/client/opensearch/_types/ShardFailure.java
index c46b36405..8dff45ebd 100644
--- a/java-client/src/generated/java/org/opensearch/client/opensearch/_types/ShardFailure.java
+++ b/java-client/src/generated/java/org/opensearch/client/opensearch/_types/ShardFailure.java
@@ -71,7 +71,8 @@ public class ShardFailure implements PlainJsonSerializable, ToCopyableBuilder<Sh
     @Nonnull
     private final ErrorCause reason;
 
-    private final int shard;
+    @Nullable
+    private final Integer shard;
 
     @Nullable
     private final String status;
@@ -83,7 +84,7 @@ private ShardFailure(Builder builder) {
         this.node = builder.node;
         this.primary = ApiTypeHelper.requireNonNull(builder.primary, this, "primary");
         this.reason = ApiTypeHelper.requireNonNull(builder.reason, this, "reason");
-        this.shard = ApiTypeHelper.requireNonNull(builder.shard, this, "shard");
+        this.shard = builder.shard;
         this.status = builder.status;
     }
 
@@ -123,9 +124,10 @@ public final ErrorCause reason() {
     }
 
     /**
-     * Required - API name: {@code shard}
+     * API name: {@code shard}
      */
-    public final int shard() {
+    @Nullable
+    public final Integer shard() {
         return this.shard;
     }
 
@@ -164,8 +166,10 @@ protected void serializeInternal(JsonGenerator generator, JsonpMapper mapper) {
         generator.writeKey("reason");
         this.reason.serialize(generator, mapper);
 
-        generator.writeKey("shard");
-        generator.write(this.shard);
+        if (this.shard != null) {
+            generator.writeKey("shard");
+            generator.write(this.shard);
+        }
 
         if (this.status != null) {
             generator.writeKey("status");
@@ -271,7 +275,7 @@ public final Builder reason(Function<ErrorCause.Builder, ObjectBuilder<ErrorCaus
         }
 
         /**
-         * Required - API name: {@code shard}
+         * API name: {@code shard}
          */
         @Nonnull
         public final Builder shard(int value) {
@@ -328,7 +332,7 @@ public int hashCode() {
         result = 31 * result + Objects.hashCode(this.node);
         result = 31 * result + Boolean.hashCode(this.primary);
         result = 31 * result + this.reason.hashCode();
-        result = 31 * result + Integer.hashCode(this.shard);
+        result = 31 * result + Objects.hashCode(this.shard);
         result = 31 * result + Objects.hashCode(this.status);
         return result;
     }
@@ -342,7 +346,7 @@ public boolean equals(Object o) {
             && Objects.equals(this.node, other.node)
             && this.primary == other.primary
             && this.reason.equals(other.reason)
-            && this.shard == other.shard
+            && Objects.equals(this.shard, other.shard)
             && Objects.equals(this.status, other.status);
     }
 }
diff --git a/java-codegen/opensearch-openapi.yaml b/java-codegen/opensearch-openapi.yaml
index b4829f72a..56ebe0172 100644
--- a/java-codegen/opensearch-openapi.yaml
+++ b/java-codegen/opensearch-openapi.yaml
@@ -38878,8 +38878,6 @@ components:
     _common___DerivedField:
       type: object
       properties:
-        name:
-          type: string
         type:
           type: string
         script:
@@ -38893,7 +38891,6 @@ components:
         format:
           type: string
       required:
-        - name
         - script
         - type
     _common___DFIIndependenceMeasure:
@@ -40849,7 +40846,6 @@ components:
       required:
         - primary
         - reason
-        - shard
     _common___ShardInfo:
       type: object
       properties: