Gateway timeout 504

I updated some indices mapping to simply add a keyword field to a text property and reloaded Kibana's index patterns. I was told I should run this command at the end:

POST 11ad.pi.prod.test-case-18/_update_by_query?conflicts=proceed

after doing it I get an error:

{
"statusCode": 504,
"error": "Gateway Time-out",
"message": "Client request timeout"
}

does it mean the timeout is too short?

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