Fix to flexCluster data source schema

internal/service/flexcluster/data_source_schema.go

@@ -16,8 +16,7 @@ func DataSourceSchema(ctx context.Context) schema.Schema {
 func dataSourceSchema(isPlural bool) map[string]schema.Attribute {
 	return map[string]schema.Attribute{
 		"project_id": schema.StringAttribute{
-			Required:            !isPlural,
-			Computed:            isPlural,
+			Required:            true,
 			MarkdownDescription: "Unique 24-hexadecimal digit string that identifies your project. Use the [/groups](#tag/Projects/operation/listProjects) endpoint to retrieve all projects to which the authenticated user has access.\n\n**NOTE**: Groups and projects are synonymous terms. Your group id is the same as your project id. For existing groups, your group/project id remains the same. The resource and corresponding endpoints use the term groups.",
 		},
 		"name": schema.StringAttribute{
@@ -88,7 +87,7 @@ func dataSourceSchema(isPlural bool) map[string]schema.Attribute {
 			Computed:            true,
 			MarkdownDescription: "Unique 24-hexadecimal digit string that identifies the instance.",
 		},
-		"mongo_dbversion": schema.StringAttribute{
+		"mongo_db_version": schema.StringAttribute{
 			Computed:            true,
 			MarkdownDescription: "Version of MongoDB that the instance runs.",
 		},