Can massage or stretching exercise relief sciatica pain or it is contraindicated??

Sure. Most times Massage/Stretching will help muscle pain due to the back pain. If it doesn't help enough, recommend seeing your doctor for a workup.
Sciatica. Massage and stretching are excellent treatment options for sciatica. In fact, these are some of the first line therapies for radiating back and leg pain. There are specific exercises for the neck and back that a physical therapist or a neurosurgeon can provide. .