Okay, so first... the nature of this is tricky. Now, here's what's going on: On upgrade, ES will re-enable the enforcement of Data Model Acceleration settings. So even though it was disabled prior to upgrade, we flip it back on for you. The reason being because it was sort of a safeguard as a number of searches depend on it. Annoying, yes. The proper way to disable acceleration is to uncheck the acceleration box for your Data Model, but leave enforcement enabled. Essentially, we're saying, enforce a value of acceleration=false. This will persist should you upgrade ES again.
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