You should be able to use ordinary initializable module infrastructure:

[InitializableModule]
[ModuleDependency(typeof (IndexingModule))]
public class ContentIndexerConfig : IInitializableModule
{
    public void Initialize(InitializationEngine context)
    {
        ContentIndexer.Instance.Conventions.ForInstancesOf<IContent>().ShouldIndex(_ => false);
        ContentIndexer.Instance.Conventions.ForInstancesOf<EditorPage>().ShouldIndex(_ => true);
        ContentIndexer.Instance.Conventions.EnablePageFilesIndexing();

        FileIndexer.Instance.Conventions.ShouldIndexVPPConvention = new VisibleInFilemanagerVPPIndexingConvention();
    }

    public void Uninitialize(InitializationEngine context)
    {
    }

    public void Preload(string[] parameters)
    {
    }
}

I prefer to specify what should be indexed, instead of what should not be indexed. I.e:

ContentIndexer.Instance.Conventions
                .ForInstancesOf<ContentBasePage>()
                .ShouldIndex(x => true);

Hi,

Thanks for the reply.

Sorry I didn't mentioned that I'm using EPiServer CMS 6 R2.

I have used below code :

[InitializableModule]

    [ModuleDependency(typeof(IndexingModule))]
    public class ContentIndexerConfig : IInitializableModule
    {
        public void Initialize(InitializationEngine context)
        {

            PageIndexer.Instance.Conventions.ForInstancesOf<PageData>().ShouldIndex(x => x.Category.IsIndexableCategoryList());
        }

        public void Uninitialize(InitializationEngine context)
        {

        }

        public void Preload(string[] parameters)
        {

        }
    }

And Extension method as :

public static bool IsIndexableCategoryList(this CategoryList pageCategoryList)
        {
            string categoryName = string.Empty;
            Category IndexCategory = Category.Find("EPiServerFindIndexable");

            if (pageCategoryList.Contains(IndexCategory.ID))
                return true;

            return false;
        }

The Code worked just fine for me.

Thanks alot!