I have a question regarding expected memory consumption when using field collapsing with the ngroups parameter. We have indexed a forum with 500.000 threads. Each thread is a group, so we can have max. 500.000 groups. I read somewhere that for each group a org.apache.lucene.util.ByteRef is created which is added to a ArrayList. Whats the content of the byte[] the ByteRef is created with? It will help me to estimate how much memory is used in worst case if all groups are returned (which is unlikly).
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