Once the chicken is done cooking, add the chicken to a food processor or a stand-mixer if you do not have a food processor. Pulse until the chicken is well-shredded (if using a stand-mixer, mix on medium speed until well-shredded). Add the chopped celery, red onion, pickles, and the mayonnaise, pickle juice, salt and pepper. Pulse or mix until well combined. Taste, and add more salt, pepper, mayo, or pickle juice until you can't stop tasting it! Store in an air tight container in the fridge for up to 4 days. Serve on toasted bread, crackers, lettuce wraps, or straight from the bowl. Enjoy!