consider query deduplication off by default and documenting its availability

[abernix]

Mostly to track a discussion that should happen.

We should at the very very least document that this behavior is on by default, but practically speaking this might be a very surprising change for those who are migrating from the Apollo Gateway. These sorts of requests do have other state-changing properties to them (like tracking for analystics, etc.).

That's not to say this isn't incredibly valuable, but I think it should be opt-in rather than opt-out and it could be a plugin.

[BrynCooke]

As we have discovered some issues with dedup this has been bumped up the priority list. #550

This is moving into a dedicated (experimental) plugin:

plugins:
  experimental.traffic_shaping: 
    all:
      dedup: true
    subgraphs: 
      products:
        dedup: false

[nateql]

Was closed on the team board so I am closing it here.