Add filter for opensearch default packages (#1130)

* Adding filter to skip default opensearch packages

Author: swhite-oreilly

resources/opensearchservice-packages.go

@@ -1,6 +1,8 @@
 package resources
 
 import (
+	"fmt"
+	"strings"
 	"time"
 
 	"github.com/aws/aws-sdk-go/aws/session"
@@ -54,6 +56,13 @@ func ListOSPackages(sess *session.Session) ([]Resource, error) {
 	return resources, nil
 }
 
+func (o *OSPackage) Filter() error {
+	if strings.HasPrefix(*o.packageID, "G") {
+		return fmt.Errorf("cannot delete default opensearch packages")
+	}
+	return nil
+}
+
 func (o *OSPackage) Remove() error {
 	_, err := o.svc.DeletePackage(&opensearchservice.DeletePackageInput{
 		PackageID: o.packageID,