Unique query id for slow log

As I know, query log is per shard. If a index has 5 shards and slow query log is enabled. when issue a query, There will be 5 query logs. I am collecting these logs for analysis. I want to aggregate these 5 logs into a log, but I can't find a unique query id. any ideas? how do I know these 5 logs comes from the same client query? Thanks.

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