Watcher is not sending email in ES 5.2

I think I have resolved previous issues.

But a strange issues I am Facing now. Google is blocking verification of email and I am getting below log for watcher --

DOING CURL --
curl -XGET localhost:9200/_xpack/watcher/watch/last_watch

Getting below response:

{"found":true,"_id":"last_watch","_status":{"version":5,"state":{"active":true,"timestamp":"2017-06-16T00:39:16.654Z"},"last_checked":"2017-06-16T00:43:00.229Z","last_met_condition":"2017-06-16T00:43:00.229Z","actions":{"email_admin":{"ack":{"timestamp":"2017-06-16T00:39:16.654Z","state":"awaits_successful_execution"},"last_execution":{"timestamp":"2017-06-16T00:43:00.229Z","successful":false,"reason":"MessagingException[failed to send email with subject [404 recently encountered] via account [gmail_account]]; nested: AuthenticationFailedException[534-5.7.14 <https://accounts.google.com/signin/continue?sarp=1&scc=1&plt=AKgnsbvF\n534-5.7.14 q0WEdpll7GFx7wL5ZoIKlaHy0J1Z58ZNsgsuseIWKkJEAaiNf5hWY11ZPPsJb6u7h9z0Xe\n534-5.7.14 kWiT264a1EJgbKW5ESeccxI0uUZ_3X4klQS4jBjB7dDw6pRU490p-yKtXkL2-Ik\n534-5.7.14 vMoQFBgYsmH2WbbGFC3Z63GBpWVH0O9LmpVsB89ZsSreIXN_bb0AX3UWwoX4dTb4UiXtmi\n534-5.7.14 ExF49I6J7QFe3yZLjP98FnMpJtkQI> Please log in via your web browser and\n534-5.7.14 then try again.\n534-5.7.14 Learn more at\n534 5.7.14 https://support.google.com/mail/answer/78754 a22sm752699pfc.115 - gsmtp\n]; "}}}},"watch":{"trigger":{"schedule":{"cron":"0 0/1 * * * ?"}},"input":{"search":{"request":{"search_type":"query_then_fetch","indices":["logstash*"],"types":[],"body":{"query":{"bool":{"must":{"match":{"methodName":"getSSLConnectionSocketFactory"}}}}}}}},"condition":{"compare":{"ctx.payload.hits.total":{"gt":0}}},"actions":{"email_admin":{"email":{"profile":"standard","to":["ankushsingh.gre@gmail.com"],"subject":"404 recently encountered"}}}}}r