diff --git a/core/plugins/org.eclipse.dltk.core.index.lucene/META-INF/MANIFEST.MF b/core/plugins/org.eclipse.dltk.core.index.lucene/META-INF/MANIFEST.MF
index 0ebc727..4e8e5cb 100644
--- a/core/plugins/org.eclipse.dltk.core.index.lucene/META-INF/MANIFEST.MF
+++ b/core/plugins/org.eclipse.dltk.core.index.lucene/META-INF/MANIFEST.MF
@@ -9,9 +9,9 @@
 Require-Bundle: org.eclipse.core.runtime,
  org.eclipse.core.resources,
  org.eclipse.dltk.core,
- org.apache.lucene.core;bundle-version="[7.1.0,7.2.0)",
- org.apache.lucene.misc;bundle-version="[7.1.0,7.2.0)",
- org.apache.lucene.analyzers-common;bundle-version="[7.1.0,7.2.0)"
+ org.apache.lucene.core;bundle-version="[7.5.0,7.6.0)",
+ org.apache.lucene.misc;bundle-version="[7.5.0,7.6.0)",
+ org.apache.lucene.analyzers-common;bundle-version="[7.5.0,7.6.0)"
 Bundle-RequiredExecutionEnvironment: JavaSE-1.8
 Bundle-ActivationPolicy: lazy
 Export-Package: org.eclipse.dltk.core.index.lucene
diff --git a/core/plugins/org.eclipse.dltk.core.index.lucene/src/org/eclipse/dltk/internal/core/index/lucene/BitFlagsQuery.java b/core/plugins/org.eclipse.dltk.core.index.lucene/src/org/eclipse/dltk/internal/core/index/lucene/BitFlagsQuery.java
index cb22e30..f97fe26 100644
--- a/core/plugins/org.eclipse.dltk.core.index.lucene/src/org/eclipse/dltk/internal/core/index/lucene/BitFlagsQuery.java
+++ b/core/plugins/org.eclipse.dltk.core.index.lucene/src/org/eclipse/dltk/internal/core/index/lucene/BitFlagsQuery.java
@@ -1,5 +1,5 @@
 /*******************************************************************************
- * Copyright (c) 2016 Zend Technologies and others.
+ * Copyright (c) 2016, 2018 Zend Technologies and others.
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0 which is available at
  * http://www.eclipse.org/legal/epl-2.0.
@@ -14,6 +14,7 @@
 import java.io.IOException;
 import java.text.MessageFormat;
 
+import org.apache.lucene.index.DocValues;
 import org.apache.lucene.index.LeafReaderContext;
 import org.apache.lucene.index.NumericDocValues;
 import org.apache.lucene.search.ConstantScoreScorer;
@@ -107,6 +108,11 @@
 				};
 				return new ConstantScoreScorer(this, 10, iterator);
 			}
+
+			@Override
+			public boolean isCacheable(LeafReaderContext ctx) {
+				return DocValues.isCacheable(ctx, IndexFields.NDV_FLAGS);
+			}
 		};
 	}
 }
diff --git a/core/releng/org.eclipse.dltk.core.targetplatform/org.eclipse.dltk.core.targetplatform.target b/core/releng/org.eclipse.dltk.core.targetplatform/org.eclipse.dltk.core.targetplatform.target
index 10c94a9..51de127 100644
--- a/core/releng/org.eclipse.dltk.core.targetplatform/org.eclipse.dltk.core.targetplatform.target
+++ b/core/releng/org.eclipse.dltk.core.targetplatform/org.eclipse.dltk.core.targetplatform.target
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<?pde version="3.8"?><target name="org.eclipse.dltk.core.targetplatform" sequenceNumber="17">
+<?pde version="3.8"?><target name="org.eclipse.dltk.core.targetplatform" sequenceNumber="18">
     <locations>
         <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="slicer" includeSource="false" type="InstallableUnit">
             <unit id="org.antlr.runtime" version="3.0.0.v200803061811"/>
@@ -9,14 +9,13 @@
         <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="slicer" includeSource="false" type="InstallableUnit">
             <unit id="com.google.guava" version="21.0.0.v20170206-1425"/>
             <unit id="com.google.guava.source" version="21.0.0.v20170206-1425"/>
-            <unit id="org.apache.lucene.analyzers-common" version="7.1.0.v20180122-2126"/>
-            <unit id="org.apache.lucene.analyzers-common.source" version="7.1.0.v20180122-2126"/>
-            <unit id="org.apache.lucene.core" version="7.1.0.v20171214-1510"/>
-            <unit id="org.apache.lucene.core.source" version="7.1.0.v20171214-1510"/>
-            <unit id="org.apache.lucene.misc" version="7.1.0.v20180220-1923"/>
-            <unit id="org.apache.lucene.misc.source" version="7.1.0.v20180220-1923"/>
-            <unit id="org.apache.lucene.queryparser" version="7.1.0.v20180828-2118"/>
-            <unit id="org.apache.lucene.queryparser.source" version="7.1.0.v20180828-2118"/>
+            <unit id="org.apache.lucene.analyzers-common" version="7.5.0.v20181003-1532"/>
+            <unit id="org.apache.lucene.analyzers-common.source" version="7.5.0.v20181003-1532"/>
+            <unit id="org.apache.lucene.core" version="7.5.0.v20181003-1532"/>
+            <unit id="org.apache.lucene.core.source" version="7.5.0.v20181003-1532"/>
+            <unit id="org.apache.lucene.misc" version="7.5.0.v20181003-1532"/>
+            <unit id="org.apache.lucene.misc.source" version="7.5.0.v20181003-1532"/>
+            <!-- DLTK depends on Lucene 7.5, but Mylyn 3.24 depends on Lucene 6.1 -->
             <unit id="org.apache.lucene.core" version="6.1.0.v20170814-1820"/>
             <unit id="org.apache.lucene.analyzers-common" version="6.1.0.v20161115-1612"/>
             <unit id="org.apache.lucene.queryparser" version="6.1.0.v20161115-1612"/>
@@ -34,20 +33,18 @@
             <unit id="org.objenesis" version="1.0.0.v201505121915"/>
             <unit id="net.bytebuddy.byte-buddy" version="0.0.0"/>
             <unit id="net.bytebuddy.byte-buddy-agent" version="0.0.0"/>
-            <repository location="http://download.eclipse.org/tools/orbit/I-builds/I20180829144012/repository/"/>
+            <repository location="http://download.eclipse.org/tools/orbit/downloads/drops/S20181031145145/repository/"/>
         </location>
         <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="slicer" includeSource="false" type="InstallableUnit">
             <unit id="org.eclipse.emf.sdk.feature.group" version="0.0.0"/>
             <unit id="org.eclipse.sdk.ide" version="0.0.0"/>
             <repository location="http://download.eclipse.org/releases/2018-09/"/>
         </location>
-        <!-- mylyn 3.24 depends on lucene 6.1, but DTP depends on lucene 7.1 -->
         <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="slicer" includeSource="false" type="InstallableUnit">
             <unit id="org.eclipse.mylyn.commons.sdk.feature.group" version="0.0.0"/>
             <unit id="org.eclipse.mylyn.context.sdk.feature.group" version="0.0.0"/>
             <unit id="org.eclipse.mylyn.sdk_feature.feature.group" version="0.0.0"/>
             <repository location="http://download.eclipse.org/mylyn/drops/3.24.1/v20180619-2220/"/>
-            <!-- <repository location="http://download.eclipse.org/mylyn/snapshots/nightly/"/> -->
         </location>
         <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="slicer" includeSource="false" type="InstallableUnit">
             <unit id="org.eclipse.linuxtools.man.feature.group" version="0.0.0"/>