Acquire stats searcher for data stream stats (#117953) (#118005)

Here, we only need to extract the minimum and maximum values of the timestamp field; therefore, using a stats searcher should suffice. This is important for frozen indices.
elastic · Dec 4, 2024 · 1849060 · 1849060
1 parent 991bb10
commit 1849060
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diff --git a/docs/changelog/117953.yaml b/docs/changelog/117953.yaml
@@ -0,0 +1,5 @@
+pr: 117953
+summary: Acquire stats searcher for data stream stats
+area: Data streams
+type: bug
+issues: []
diff --git a/...s/src/main/java/org/elasticsearch/datastreams/action/DataStreamsStatsTransportAction.java b/...s/src/main/java/org/elasticsearch/datastreams/action/DataStreamsStatsTransportAction.java
@@ -31,6 +31,7 @@
 import org.elasticsearch.index.Index;
 import org.elasticsearch.index.IndexService;
 import org.elasticsearch.index.engine.Engine;
+import org.elasticsearch.index.engine.ReadOnlyEngine;
 import org.elasticsearch.index.shard.IndexShard;
 import org.elasticsearch.index.store.StoreStats;
 import org.elasticsearch.indices.IndicesService;
@@ -130,7 +131,7 @@ protected void shardOperation(
             DataStream dataStream = indexAbstraction.getParentDataStream();
             assert dataStream != null;
             long maxTimestamp = 0L;
-            try (Engine.Searcher searcher = indexShard.acquireSearcher("data_stream_stats")) {
+            try (Engine.Searcher searcher = indexShard.acquireSearcher(ReadOnlyEngine.FIELD_RANGE_SEARCH_SOURCE)) {
                 IndexReader indexReader = searcher.getIndexReader();
                 byte[] maxPackedValue = PointValues.getMaxPackedValue(indexReader, DataStream.TIMESTAMP_FIELD_NAME);
                 if (maxPackedValue != null) {