UnhandledPromiseRejectionWarning: Error: invalid command ping www.google.com

I am attempting to connect to one of my network switches via ssh and just run the command ping www.google.com but get the following error:

node index.js
Ping Completed
(node:56662) UnhandledPromiseRejectionWarning: Error: invalid command www.google.com.
...

My config:

ssh
  .connect({
    host: "172.35.0.2",
    username: "admin",
    port: 22,
    password,
    // debug: console.log,
    algorithms: {
      kex: [
        "diffie-hellman-group1-sha1",
        "ecdh-sha2-nistp256",
        "ecdh-sha2-nistp384",
        "ecdh-sha2-nistp521",
        "diffie-hellman-group-exchange-sha256",
        "diffie-hellman-group14-sha1",
      ],
      cipher: [
        "3des-cbc",
        "aes128-ctr",
        "aes192-ctr",
        "aes256-ctr",
        "aes128-gcm",
        "aes128-gcm@openssh.com",
        "aes256-gcm",
        "aes256-gcm@openssh.com",
      ],
      serverHostKey: [
        "ssh-rsa",
        "ecdsa-sha2-nistp256",
        "ecdsa-sha2-nistp384",
        "ecdsa-sha2-nistp521",
      ],
      hmac: ["hmac-sha2-256", "hmac-sha2-512", "hmac-sha1"],
    },
  })
  .then(() => {
    ssh
      .execCommand("ping www.google.com", { options: { pty: true } })
      .then((result) => {
        console.log("STDOUT: " + result.stdout);
        console.log("STDERR: " + result.stderr);
      });
  })
  .then(
    function () {
      console.log("Ping Completed");
    },
    function (error) {
      console.log("Something's wrong");
      console.log(error);
    }
  );

What am I doing wrong?

I am able to manually connect to the switch and run ping successfully:

olt-lab-01# ping www.google.com
Resolving www.google.com... 172.217.170.100
 sent  rcvd  rate    rtt     avg    mdev     max     min  reply from
    1     1  100      20      20       0      20      20  172.217.170.100
    2     2  100      95      29      19      95      20  172.217.170.100
    3     3  100      18      28      17      95      18  172.217.170.100
olt-lab-01# 

Start with the supplied index.js example and trace the execCommand("ping www.google.com") entry point in node-ssh. Check how the command and its arguments are sent to the switch, then compare the returned error with the manual session. Done means the reproduction is explained and the behavior or usage is verified.