LPD-65239 portal-search: allow size 0 searches for counts

https://liferay.atlassian.net/browse/LPD-65239

Author: joshuacords

modules/apps/portal-search/portal-search/src/main/java/com/liferay/portal/search/internal/permission/DefaultSearchResultPermissionFilter.java

@@ -824,10 +824,8 @@ public SlidingWindowHelper(int start, int end) {
 				_start = start;
 				_end = end;
 
-				_delta = end - start;
-
-				_documents = new CircularFifoQueue<>(_delta);
-				_scores = new CircularFifoQueue<>(_delta);
+				_documents = new CircularFifoQueue<>(Math.max(1, end - start));
+				_scores = new CircularFifoQueue<>(Math.max(1, end - start));
 			}
 
 			public boolean add(Document document, Float score) {
@@ -869,7 +867,6 @@ public int getTotalDocs() {
 				return _totalDocs;
 			}
 
-			private final int _delta;
 			private final CircularFifoQueue<Document> _documents;
 			private int _documentsDiscarded;
 			private final int _end;

modules/apps/portal-search/portal-search/src/test/java/com/liferay/portal/search/internal/permission/DefaultSearchResultPermissionFilterTest.java

@@ -23,14 +23,16 @@
 import com.liferay.portal.search.searcher.SearchRequest;
 import com.liferay.portal.search.searcher.SearchRequestBuilder;
 import com.liferay.portal.test.rule.LiferayUnitTestRule;
+
+import java.util.Arrays;
+import java.util.function.Function;
+
 import org.junit.Assert;
 import org.junit.ClassRule;
 import org.junit.Rule;
 import org.junit.Test;
-import org.mockito.Mockito;
 
-import java.util.Arrays;
-import java.util.function.Function;
+import org.mockito.Mockito;
 
 /**
  * @author Gustavo Lima