fix: allowed nil values

es.go

@@ -1186,19 +1186,19 @@ func (c *Client) SnapshotAllIndicesWithBodyParams(repository string, snapshot st
 		return errors.New("empty string for snapshot is not allowed")
 	}
 
-	if bodyParams == nil {
-		return errors.New("no body params provided, please use SnapshotAllIndices Function instead")
-	}
-
 	parsedJSON, parsingErr := json.Marshal(bodyParams)
 
 	if parsingErr != nil {
 		return parsingErr
 	}
 
-	agent := c.buildPutRequest(fmt.Sprintf("_snapshot/%s/%s", repository, snapshot)).
-		Set("Content-Type", "application/json").
-		Send(string(parsedJSON))
+	agent := c.buildPutRequest(fmt.Sprintf("_snapshot/%s/%s", repository, snapshot))
+
+	if bodyParams != nil {
+		agent = agent.
+			Set("Content-Type", "application/json").
+			Send(string(parsedJSON))
+	}
 
 	_, err := handleErrWithBytes(agent)
 

es_test.go

@@ -1430,11 +1430,10 @@ func TestSnapshotAllIndicesWithAdditionalParametersIncludeGlobalState(t *testing
 	}
 }
 
-func TestSnapshotAllIndicesWithAdditionalParametersErr(t *testing.T) {
+func TestSnapshotAllIndicesWithAdditionalParametersNilValue(t *testing.T) {
 	testSetup := &ServerSetup{
 		Method:   "PUT",
 		Path:     "/_snapshot/backup-repo/snapshot1",
-		Body:     `{"metadata":{"taken_because":"backup before upgrading","taken_by":"user123"}}`,
 		Response: `{"acknowledged": true }`,
 	}
 
@@ -1444,8 +1443,8 @@ func TestSnapshotAllIndicesWithAdditionalParametersErr(t *testing.T) {
 
 	err := client.SnapshotAllIndicesWithBodyParams("backup-repo", "snapshot1", nil)
 
-	if err == nil {
-		t.Fatalf("should have thrown an error")
+	if err != nil {
+		t.Fatalf("Should be able to take Nil body params: %s", err)
 	}
 }