From what I have seen everyone is on the fringes of not knowing. Published material makes mention of pollination by insects but that covers a lot of ground.
This paper
http://horttech.ashspublications.org/content/11/1/79.full.pdf
expressly mentions bees.
Honey bees may be a different topic though.
This search list may help you if you want to click the links
Eleutherococcus senticocus pollination bees
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