MongoDB Reactive Streams: Correcting Aggregates.group and Accumulators.first Syntax

Aggregates.group(new Document('_id', new Document('timestamp', '$timestamp') .append('url', '$url')))
.first('breadcrumbObject.data.to').as('path'),

        Aggregates.group(new Document())
            .count().as('pathNum')
            .sum('callNum').as('totalCallNum'),

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