Upgrading from 5.6 to 7.5.0 -> What problems could I face on the query/aggregation side and indexing side

We do basic bool/must type queries based a couple of fields and several nested terms aggregations with some sum aggs.

On the indexing side of things we're going with bulk indexing.

My team is getting a new cluster set up for us and don't have to worry about the administration side of things.

Are their any huge changes with data types, templates, basic queries and aggregations I should be aware of?

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