int docid = 0;
int numRounds = atLeast(10);
for (int rnd = 0; rnd < numRounds; rnd++) {
Document doc = new Document();
doc.add(new StringField("key", "doc", Store.NO));
doc.add(new NumericDocValuesField("ndv", -1));
int numDocs = atLeast(30);
for (int i = 0; i < numDocs; i++) {
doc.removeField("id");
doc.add(new StringField("id", Integer.toString(docid++), Store.NO));
writer.addDocument(doc);
}
long value = rnd + 1;
writer.updateNumericDocValue(new Term("key", "doc"), "ndv", value);
if (random.nextDouble() < 0.2) { // randomly delete some docs
writer.deleteDocuments(new Term("id", Integer.toString(random.nextInt(docid))));
}
// randomly commit or reopen-IW (or nothing), before forceMerge
if (random.nextDouble() < 0.4) {
writer.commit();
} else if (random.nextDouble() < 0.1) {
writer.close();
writer = new IndexWriter(dir, conf.clone());
}
// add another document with the current value, to be sure forceMerge has
// something to merge (for instance, it could be that CMS finished merging
// all segments down to 1 before the delete was applied, so when
// forceMerge is called, the index will be with one segment and deletes
// and some MPs might now merge it, thereby invalidating test's
// assumption that the reader has no deletes).
doc = new Document();
doc.add(new StringField("id", Integer.toString(docid++), Store.NO));
doc.add(new StringField("key", "doc", Store.NO));
doc.add(new NumericDocValuesField("ndv", value));
writer.addDocument(doc);
writer.forceMerge(1, true);
final DirectoryReader reader;
if (random.nextBoolean()) {