If you want to jump start a vegetable pickling process you can add one or two capsules of probiotic powder. I have done this. NOW FOODS brand vitamins used to have a great deal on 3oz of probiotic powder but now you have to buy it in the more expensive capsule form.
Before we had bottled beer and beer in cans...... all beer was non-pasturized and was teaming with great probiotic bacteria. Any real micro-brewery will have its own non-pasturized beer on tap.
As a generalization...... You get a quart of plain Greek style yogurt and all the bacterial cultures are intact. To make a fruity yogurt out of this...just stir in some jam or jelly. But just a spoonful of honey or real old timey black molasses is also good and what I like
I make yogurt from raw milk I get from a friend of mine that has a minifarm.
You can also use the whey from the yogurt to add to your pickle brine for a jump start.