code: public final void deleteSession(SessionName name) {
  
      DeleteSessionRequest request =
          DeleteSessionRequest.newBuilder().setName(name == null ? null : name.toString()).build();
      deleteSession(request);
    }
docs: Ends a session, releasing server resources associated with it. This will asynchronously trigger
  cancellation of any operations that are running with this session.
  
  <p>Sample code:
  
  <pre><code>
  try (SpannerClient spannerClient = SpannerClient.create()) {
  SessionName name = SessionName.of("[PROJECT]", "[INSTANCE]", "[DATABASE]", "[SESSION]");
  spannerClient.deleteSession(name);
  }
  </code></pre>
  
  @param name Required. The name of the session to delete.
  @throws com.google.api.gax.rpc.ApiException if the remote call fails