I cannot load kibana from browser and got different errors when reloading it

I cannot load kibana from browser, sometimes I got the following error when reloading kibana:

{"statusCode":429,"error":"Too Many Requests","message":"[circuit_breaking_exception] [parent] Data too large, data for [<http_request>] would be [2129660744/1.9gb], which is larger than the limit of [2023548518/1.8gb], real usage: [2129660744/1.9gb], new bytes reserved: [0/0b], usages [request=16440/16kb, fielddata=25773978/24.5mb, in_flight_requests=922268352/879.5mb, accounting=52862167/50.4mb], with { bytes_wanted=2129660744 & bytes_limit=2023548518 & durability="TRANSIENT" }"}

but sometimes I got this:
{"statusCode":504,"error":"Gateway Time-out","message":"Gateway Timeout"}

and sometimes I got:
{"statusCode":503,"error":"Service Unavailable","message":"Service Unavailable"}

What could be the reason?

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