Remove future_lapply from AnnoySearch#10426
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IntegrateLayershangs on multicore plans (reported at #10420 and confirmed)IntegrateLayers(..., method = RPCAIntegration)goes throughFindIntegrationAnchors(), which already parallelizes pairwise anchor computations with future. Inside that path,AnnoySearchwas also usingfuture_lapply().With a multicore plan and workers > 1, this creates a nested future/fork situation, likely the cause of the hang.
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