Pasta and green lentil soup

This recipe is from cookbook called 500 all time great recipes.  Recipe used ham or salt pork but I didn't use any meat for this dish. Also, recipe used 2 1/2 cup small soup pasta but I used 1 cup instead.
Ingredients
1 cup dried green or brown lentils
2 tbsp olive oil

1 onion finely chopped
3 celery stalk finely chopped
1 big carrot finely chopped
6 cups chicken stock
1 tsp dried thyme
salt and pepper
1 cup small soup pasta
chopped parsley for the garnish

Preparation Method
Place lentils in a bowl, cover them with cold water and soak for 2-3 hours.Rinse and drain well through a strainer.
Heat oil in a large saucepan and saute onion and cook gently until softens.
Stir celery and carrot and cook for 5 minutes more stirring frequently. Add lentils and then pour in the stock add the herbs and bring the soup the boil. Cook for about 1 hour. season to taste.
Stir in the pasta and cook until it is just done.