diff --git a/oak-lucene/src/test/java/org/apache/jackrabbit/oak/plugins/index/lucene/LucenePropertyIndexTest.java b/oak-lucene/src/test/java/org/apache/jackrabbit/oak/plugins/index/lucene/LucenePropertyIndexTest.java
index 8c8dfd3dbb..78236f0f0f 100644
--- a/oak-lucene/src/test/java/org/apache/jackrabbit/oak/plugins/index/lucene/LucenePropertyIndexTest.java
+++ b/oak-lucene/src/test/java/org/apache/jackrabbit/oak/plugins/index/lucene/LucenePropertyIndexTest.java
@@ -30,7 +30,9 @@ import static org.apache.jackrabbit.JcrConstants.JCR_DATA;
 import static org.apache.jackrabbit.JcrConstants.NT_FILE;
 import static org.apache.jackrabbit.oak.api.QueryEngine.NO_BINDINGS;
 import static org.apache.jackrabbit.oak.api.QueryEngine.NO_MAPPINGS;
+import static org.apache.jackrabbit.oak.api.Type.BOOLEAN;
 import static org.apache.jackrabbit.oak.api.Type.NAMES;
+import static org.apache.jackrabbit.oak.api.Type.STRING;
 import static org.apache.jackrabbit.oak.api.Type.STRINGS;
 import static org.apache.jackrabbit.oak.plugins.index.IndexConstants.ASYNC_PROPERTY_NAME;
 import static org.apache.jackrabbit.oak.plugins.index.IndexConstants.DECLARING_NODE_TYPES;
@@ -74,8 +76,11 @@ import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
 import java.text.ParseException;
+import java.util.ArrayList;
+import java.util.Arrays;
 import java.util.Calendar;
 import java.util.Collections;
+import java.util.Iterator;
 import java.util.LinkedList;
 import java.util.List;
 import java.util.Map;
@@ -115,6 +120,7 @@ import org.apache.jackrabbit.oak.plugins.index.nodetype.NodeTypeIndexProvider;
 import org.apache.jackrabbit.oak.plugins.index.property.PropertyIndexEditorProvider;
 import org.apache.jackrabbit.oak.plugins.memory.ArrayBasedBlob;
 import org.apache.jackrabbit.oak.plugins.memory.MemoryNodeStore;
+import org.apache.jackrabbit.oak.plugins.memory.MultiStringPropertyState;
 import org.apache.jackrabbit.oak.plugins.memory.PropertyStates;
 import org.apache.jackrabbit.oak.plugins.nodetype.TypeEditorProvider;
 import org.apache.jackrabbit.oak.plugins.nodetype.write.InitialContent;
@@ -2316,6 +2322,60 @@ public class LucenePropertyIndexTest extends AbstractQueryTest {
     }
 
     @Test
+    public void facetsInMultipleRoots() throws Exception {
+        // OAK-7109
+        Tree luceneIndex = createFullTextIndex(root.getTree("/"), "lucene");
+        Tree ntBaseProperties = luceneIndex
+                .getChild(LuceneIndexConstants.INDEX_RULES)
+                .getChild("nt:base")
+                .getChild(LuceneIndexConstants.PROP_NODE);
+        ntBaseProperties.setOrderableChildren(true);
+
+        Tree simpleTags = ntBaseProperties.addChild("simpleTags");
+        simpleTags.setProperty("facets", true, BOOLEAN);
+        simpleTags.setProperty("name", "simple/tags", STRING);
+        simpleTags.setProperty("propertyIndex", true, BOOLEAN);
+        simpleTags.setProperty("stored", true, BOOLEAN);
+        simpleTags.orderBefore("allProps");
+
+        root.commit();
+
+        final List<String> names = new ArrayList<>(2);
+        // create a document with a simple/tags property in /content1
+        Tree node1 = root.getTree("/").addChild("content1").addChild("test").addChild("foo");
+        Tree node1Simple = node1.addChild("simple");
+        node1.setProperty("text", "lorem ipsum");
+        node1Simple.setProperty(MultiStringPropertyState.stringProperty("tags", Arrays.asList("tag1", "tag2")));
+        names.add(node1.getPath());
+        // now create a document without simple/tags property in content2
+        Tree node2 = root.getTree("/").addChild("content2").addChild("test").addChild("bar");
+        node2.setProperty("text", "lorem ipsum");
+        Tree node2Simple = node2.addChild("simple");
+        node2Simple.setProperty(MultiStringPropertyState.stringProperty("tags", Arrays.asList("tag1", "tag2")));
+        names.add(node2.getPath());
+        // now create a document without simple/tags property in content3
+        Tree node3 = root.getTree("/").addChild("content3").addChild("test").addChild("bar");
+        node3.setProperty("text", "lorem ipsum");
+        Tree node3Simple = node3.addChild("simple");
+        node3Simple.setProperty(MultiStringPropertyState.stringProperty("tags", Arrays.asList("tag1", "tag2")));
+
+        root.commit();
+        // then query only for /content1 and /content2
+        String query = "select [rep:facet(simple/tags)] from [nt:base] as a where contains(a.[*], 'ipsum') and "
+                + "(isdescendantnode(a,'/content1') or isdescendantnode(a,'/content2'))";
+        assertQuery(query, names);
+
+        Iterator<? extends ResultRow> results = executeQuery(query, SQL2, Collections.<String, PropertyValue>emptyMap()).getRows().iterator();
+        assertTrue(results.hasNext());
+        ResultRow firstRow = results.next();
+        PropertyValue facets = firstRow.getValue("rep:facet(simple/tags)");
+        assertNotNull(facets);
+        // our result set is 2 results long, so as all of the documents have the same tags we assume the count of both dimensions is 2
+        assertEquals("{\"tag1\":2,\"tag2\":2}", facets.getValue(STRING));
+
+    }
+
+    @Test
     public void longRepExcerpt() throws Exception {
         Tree luceneIndex = createFullTextIndex(root.getTree("/"), "lucene");