salvatorecampagna commented on code in PR #15378:
URL: https://github.com/apache/lucene/pull/15378#discussion_r2482348482
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lucene/core/src/java/org/apache/lucene/index/MergePolicy.java:
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@@ -939,4 +939,96 @@ static final class MergeReader {
this.hardLiveDocs = hardLiveDocs;
}
}
+
+ /**
+ * Observer for merge operations returned by {@link
IndexWriter#forceMergeDeletes(boolean)}.
+ * Provides methods to query merge status and wait for completion.
+ *
+ * <p>When no merges are needed, {@link #hasNewMerges()} returns {@code
false} and {@link
+ * #numMerges()} returns 0. In this case, {@link #await()} returns {@code
true} immediately since
+ * there is nothing to wait for.
+ *
+ * @lucene.experimental
+ */
+ public static final class MergeObserver {
+ private final MergePolicy.MergeSpecification spec;
+
+ MergeObserver(MergePolicy.MergeSpecification spec) {
+ this.spec = spec;
+ }
+
+ /**
+ * Returns the number of merges in this specification.
+ *
+ * @return number of merges, or 0 if no merges were scheduled
+ */
+ public int numMerges() {
Review Comment:
Excellent suggestion! This is a far better way to provide progress tracking
without exposing mutable `OneMerge` objects. I'll add `numCompletedMerges()`
that iterates through the merges and checks `mergeCompleted.isDone()`.
Users can then track progress as: `100 * numCompletedMerges() / numMerges()`
I'll also update `toString()` to show the completion count for better
debugging.
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