Slow log explanation

I had a confusion after looking at a slow log and wanted some help in getting that clarified, can someone help me understand what total_shards[] stands for in fetch phase slow logs.

I'm assuming that it's either the total number of shards in the index or number of shards that are queried. It's weird that I see a value of 1766 when I have less than these number of shards in that index. Has that something to do with other indices present, although log print only one index name.

Can you post the log entry?

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