You would connect the AP to the same vlan on the switch that the WLC is also connected to. Unless you're trying to directly connect a single AP to the WLC. If that is what you're trying to do, then I cannot do the aggregation.
Here's a link: https://www.cisco.com/c/en/us/support/docs/wireless/8500-series-wireless-controllers/113695-8500-dg-00.html
The very last paragraph
Link Aggregation (LAG)
LAG across the 2x10G interfaces is supported in software versions 7.4 and later. The LAG configuration allows for an active-active link operation with fast failover link redundancy.
Note: The additional active 10G link does not change the total controller network throughput.
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