title: JMeter - How to verify that particular elements of response json are present
body: <p>I have a REST request that have a response similar to:
      {"names": ["Peter","John","Lily","Maria"]}
  I need an assertation  that verifies the number of elements is at least 3 (true in the case above, because there are total of 4 elements) and that the elements - "John" amnd "Maria" are present (I don't care for the other values).
  How can I accomplish this?</p>