Bearer key require when using Clien builder php client library

I keep getting this error

{"error":{"root_cause":[{"type":"security_exception","reason":"action [indices:data/write/index] requires authentication","header":{"WWW-Authenticate":["Bearer realm=\"security\"","ApiKey","Basic realm=\"security\" charset=\"UTF-8\""]}}],"type":"security_exception","reason":"action [indices:data/write/index] requires authentication","header":{"WWW-Authenticate":["Bearer realm=\"security\"","ApiKey","Basic realm=\"security\" charset=\"UTF-8\""]}},"status":401}

im using php client library , as i see in the console didt have any key / option to generate key .