https://tinkerpop.apache.org/javadocs/3.7.6-SNAPSHOT/full/org/apache/tinkerpop/gremlin/process/computer/traversal/lambda/HaltedTraversersCountTraversal.html
HaltedTraversersCountTraversal (Apache TinkerPop 3.7.6-SNAPSHOT API)
apache tinkerpopsnapshotapi