"Service Unavailable" on aggs query search

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I have a aggregation query written in nodejs. I have couple of aggregation queries in the node api.
It happens randomly and only a couple times in a day that I get error

              Invoke Error    {
                        "msg":"Service Unavailable",
                        "path":"/index_name/_search",
                        "query":{"type":"_doc"},
                        "body":"{\"query\":{<aggregation queries>}}",
                         "statusCode":503,
                        "response":"{\"Message\":null}"}

Most times it works normally.

I also get timeout error in api. I have timeout of 28s. This also happens sometimes so can't really recreate the error.

Any suggestions?

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