Github user guidotag commented on the pull request:
https://github.com/apache/lucenenet/pull/103#issuecomment-75101543
Java's priority queue can manage an "unbounded" number of elements and to
do so it uses a resizable representation. From PriorityQueue's javadoc: "A
priority queue is unbounded, but has an internal capacity governing the size of
an array used to store the elements on the queue. It is always at least as
large as the queue size. As elements are added to a priority queue, its
capacity grows automatically." So yes, it has an internal resizing procedure.
In the TopTermRewrite class it is not clear what size we will need at most:
https://github.com/guidotag/lucenenet/commit/9428451c8ee87b39efeb2c39b94eb153067a066e#diff-226e1a7768fe596cf640cfef43c6f60fL74
so we need the representation's size to grow dynamically.
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