diff --git a/provider/resource_opensearch_index.go b/provider/resource_opensearch_index.go
index 96000aa..708c9ac 100644
--- a/provider/resource_opensearch_index.go
+++ b/provider/resource_opensearch_index.go
@@ -152,6 +152,7 @@ var (
 			Type:        schema.TypeString,
 			Description: "Number of shard replicas. A stringified number.",
 			Optional:    true,
+			Computed:    true,
 		},
 		"auto_expand_replicas": {
 			Type:        schema.TypeString,
@@ -634,8 +635,10 @@ func resourceOpensearchIndexUpdate(d *schema.ResourceData, meta interface{}) err
 	settings := make(map[string]interface{})
 	for _, key := range settingsKeys {
 		schemaName := strings.Replace(key, ".", "_", -1)
-		if d.HasChange(schemaName) {
-			settings[key] = d.Get(schemaName)
+		if _, ok := d.GetOk(schemaName); ok {
+			if d.HasChange(schemaName) {
+				settings[key] = d.Get(schemaName)
+			}
 		}
 	}
 
diff --git a/provider/resource_opensearch_index_test.go b/provider/resource_opensearch_index_test.go
index d353165..9b86231 100644
--- a/provider/resource_opensearch_index_test.go
+++ b/provider/resource_opensearch_index_test.go
@@ -40,6 +40,11 @@ resource "opensearch_index" "test" {
   indexing_slowlog_threshold_index_warn = "5s"
   indexing_slowlog_level                = "warn"
 }
+`
+	testAccOpensearchIndexDefaultShardsReplicas = `
+resource "opensearch_index" "testdefaultshardsreplicas" {
+  name = "terraform-testdefaultshardsreplicas"
+}
 `
 	testAccOpensearchIndexAnalysis = `
 resource "opensearch_index" "test" {
@@ -250,6 +255,28 @@ func TestAccOpensearchIndex(t *testing.T) {
 	})
 }
 
+func TestAccOpensearchIndexDefaultShardsReplicas(t *testing.T) {
+	resource.Test(t, resource.TestCase{
+		PreCheck:     func() { testAccPreCheck(t) },
+		Providers:    testAccProviders,
+		CheckDestroy: checkOpensearchIndexDestroy,
+		Steps: []resource.TestStep{
+			{
+				Config: testAccOpensearchIndexDefaultShardsReplicas,
+				Check: resource.ComposeTestCheckFunc(
+					checkOpensearchIndexExists("opensearch_index.testdefaultshardsreplicas"),
+				),
+			},
+			{
+				Config: testAccOpensearchIndexDefaultShardsReplicas,
+				Check: resource.ComposeTestCheckFunc(
+					checkOpensearchIndexExists("opensearch_index.testdefaultshardsreplicas"),
+				),
+			},
+		},
+	})
+}
+
 func TestAccOpensearchIndex_rolloverAliasOpendistro(t *testing.T) {
 	provider := Provider()
 	diags := provider.Configure(context.Background(), &terraform.ResourceConfig{})