Upgrade to lucene-7.0.0-snapshot-ad2cb77. (#25349)

Most notable changes:
 - better update concurrency: LUCENE-7868
 - TopDocs.totalHits is now a long: LUCENE-7872
 - QueryBuilder does not remove the boolean query around multi-term synonyms:
   LUCENE-7878
 - removal of Fields: LUCENE-7500

For the `TopDocs.totalHits` change, this PR relies on the fact that the encoding
of vInts and vLongs are compatible: you can write and read with any of them as
long as the value can be represented by a positive int.

1 files changed, 1 insertions, 1 deletions

diff --git a/core/src/main/java/org/elasticsearch/search/aggregations/metrics/tophits/InternalTopHits.java b/core/src/main/java/org/elasticsearch/search/aggregations/metrics/tophits/InternalTopHits.java
index d1986f2dd2..e2cb84f03a 100644
--- a/core/src/main/java/org/elasticsearch/search/aggregations/metrics/tophits/InternalTopHits.java
+++ b/core/src/main/java/org/elasticsearch/search/aggregations/metrics/tophits/InternalTopHits.java
@@ -191,7 +191,7 @@ public class InternalTopHits extends InternalAggregation implements TopHits {
     protected int doHashCode() {
         int hashCode = from;
         hashCode = 31 * hashCode + size;
-        hashCode = 31 * hashCode + topDocs.totalHits;
+        hashCode = 31 * hashCode + Long.hashCode(topDocs.totalHits);
         for (int d = 0; d < topDocs.scoreDocs.length; d++) {
             ScoreDoc doc = topDocs.scoreDocs[d];
             hashCode = 31 * hashCode + doc.doc;