@Test
  public void testHashIndexSetAdd() throws Exception {
    int numEntries = 100;
    setupHashIndexSet(numEntries);

    assertEquals(numEntries, his.size());
    his.iterator().forEachRemaining((e -> portfolioSet.remove(e)));
    assertTrue(portfolioSet.isEmpty());
  }
we are "indexed" on indexKey. Equality of portfolios is based on ID indexKeys are based on 0 ->
numEntries IDs are startID -> startID + numEntries

@param numToCreate how many portfolios to create
@param startID the ID value to start incrementing from
geode-core/src/test/java/org/apache/geode/cache/query/internal/index/HashIndexSetJUnitTest.java