public interface ProcessingPipeline {
    public SomeContext processFile(SomeContext ctx);
}

public class DefaultProcessingPipeline implements ProcessingPipeline {
    @Override
    public SomeContext processFile(SomeContext ctx) {
        // Default impl goes here, i.e.
        ctx.setBodyText(parseTika(ctx))
        ctx.setEsDoc = createElasticDoc(ctx)
        return ctx
    }

    protected SomeContext createElasticDoc(SomeContext ctx) ...
}

public class CustomProcessingPipeline extends DefaultProcessingPipeline {
    @Override
    public SomeContext processFile(SomeContext ctx) {
        // Custom impl, override what you need
        return ctx
    }
}