diff --git a/.classpath b/.classpath
index bdf89be5c..bef2c2b61 100644
--- a/.classpath
+++ b/.classpath
@@ -60,8 +60,8 @@
 	<classpathentry kind="lib" path="lib/fontbox-1.7.0.jar"/>
 	<classpathentry kind="lib" path="lib/pdfbox-1.7.0.jar"/>
 	<classpathentry kind="lib" path="lib/jempbox-1.7.0.jar"/>
-	<classpathentry kind="lib" path="lib/apache-solr-core-3.6.1.jar"/>
-	<classpathentry kind="lib" path="lib/apache-solr-solrj-3.6.1.jar"/>
+	<classpathentry kind="lib" path="lib/apache-solr-core-3.6.1.jar" sourcepath="/Volumes/Raptor/Data/sourcecode/solr-3.6.1/core/src/java"/>
+	<classpathentry kind="lib" path="lib/apache-solr-solrj-3.6.1.jar" sourcepath="/Volumes/Raptor/Data/sourcecode/solr-3.6.1/core/src/java"/>
 	<classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4"/>
 	<classpathentry kind="lib" path="lib/icu4j-core.jar"/>
 	<classpathentry kind="lib" path="lib/htmllexer.jar"/>
diff --git a/source/net/yacy/cora/services/federated/solr/AbstractSolrConnector.java b/source/net/yacy/cora/services/federated/solr/AbstractSolrConnector.java
index a7de26fcd..7ba32d6ba 100644
--- a/source/net/yacy/cora/services/federated/solr/AbstractSolrConnector.java
+++ b/source/net/yacy/cora/services/federated/solr/AbstractSolrConnector.java
@@ -141,6 +141,20 @@ public class AbstractSolrConnector implements SolrConnector {
         }
     }
 
+    /**
+     * delete entries from solr according the given solr query string
+     * @param id the url hash of the entry
+     * @throws IOException
+     */
+    @Override
+    public void deleteByQuery(final String querystring) throws IOException {
+        try {
+            this.server.deleteByQuery(querystring, this.commitWithinMs);
+        } catch (final Throwable e) {
+            throw new IOException(e);
+        }
+    }
+
     @Override
     public boolean exists(final String id) throws IOException {
         try {
diff --git a/source/net/yacy/cora/services/federated/solr/MirrorSolrConnector.java b/source/net/yacy/cora/services/federated/solr/MirrorSolrConnector.java
index bf306a193..4830d3bdd 100644
--- a/source/net/yacy/cora/services/federated/solr/MirrorSolrConnector.java
+++ b/source/net/yacy/cora/services/federated/solr/MirrorSolrConnector.java
@@ -170,6 +170,15 @@ public class MirrorSolrConnector implements SolrConnector {
         if (this.solr1 != null) this.solr1.delete(ids);
     }
 
+    @Override
+    public void deleteByQuery(final String querystring) throws IOException {
+        if (this.solr0 != null) this.solr0.deleteByQuery(querystring);
+        if (this.solr1 != null) this.solr1.deleteByQuery(querystring);
+        this.hitCache.clear();
+        this.missCache.clear();
+        this.documentCache.clear();
+    }
+
     /**
      * check if a given id exists in solr
      * @param id
diff --git a/source/net/yacy/cora/services/federated/solr/MultipleSolrConnector.java b/source/net/yacy/cora/services/federated/solr/MultipleSolrConnector.java
index 983a89cc8..144a1287b 100644
--- a/source/net/yacy/cora/services/federated/solr/MultipleSolrConnector.java
+++ b/source/net/yacy/cora/services/federated/solr/MultipleSolrConnector.java
@@ -128,6 +128,11 @@ public class MultipleSolrConnector implements SolrConnector {
         this.solr.delete(ids);
     }
 
+    @Override
+    public void deleteByQuery(final String querystring) throws IOException {
+        this.solr.deleteByQuery(querystring);
+    }
+
     @Override
     public boolean exists(String id) throws IOException {
         return this.solr.exists(id);
diff --git a/source/net/yacy/cora/services/federated/solr/RetrySolrConnector.java b/source/net/yacy/cora/services/federated/solr/RetrySolrConnector.java
index 0fd577676..ec7f48e3c 100644
--- a/source/net/yacy/cora/services/federated/solr/RetrySolrConnector.java
+++ b/source/net/yacy/cora/services/federated/solr/RetrySolrConnector.java
@@ -103,6 +103,21 @@ public class RetrySolrConnector implements SolrConnector {
         if (ee != null) throw (ee instanceof IOException) ? (IOException) ee : new IOException(ee.getMessage());
     }
 
+    @Override
+    public void deleteByQuery(final String querystring) throws IOException {
+        final long t = System.currentTimeMillis() + this.retryMaxTime;
+        Throwable ee = null;
+        while (System.currentTimeMillis() < t) try {
+            this.solrConnector.deleteByQuery(querystring);
+            return;
+        } catch (final Throwable e) {
+            ee = e;
+            try {Thread.sleep(10);} catch (final InterruptedException e1) {}
+            continue;
+        }
+        if (ee != null) throw (ee instanceof IOException) ? (IOException) ee : new IOException(ee.getMessage());
+    }
+
     @Override
     public boolean exists(final String id) throws IOException {
         final long t = System.currentTimeMillis() + this.retryMaxTime;
diff --git a/source/net/yacy/cora/services/federated/solr/ShardSolrConnector.java b/source/net/yacy/cora/services/federated/solr/ShardSolrConnector.java
index 52eaa6309..eddc6fff5 100644
--- a/source/net/yacy/cora/services/federated/solr/ShardSolrConnector.java
+++ b/source/net/yacy/cora/services/federated/solr/ShardSolrConnector.java
@@ -104,6 +104,11 @@ public class ShardSolrConnector implements SolrConnector {
         for (final SolrConnector connector: this.connectors) connector.delete(ids);
     }
 
+    @Override
+    public void deleteByQuery(final String querystring) throws IOException {
+        for (final SolrConnector connector: this.connectors) connector.deleteByQuery(querystring);
+    }
+
     /**
      * check if a given id exists in solr
      * @param id
diff --git a/source/net/yacy/cora/services/federated/solr/SolrConnector.java b/source/net/yacy/cora/services/federated/solr/SolrConnector.java
index 41434c4a0..cf79f0796 100644
--- a/source/net/yacy/cora/services/federated/solr/SolrConnector.java
+++ b/source/net/yacy/cora/services/federated/solr/SolrConnector.java
@@ -72,6 +72,13 @@ public interface SolrConnector {
      */
     public void delete(final List<String> ids) throws IOException;
 
+    /**
+     * delete entries from solr according the given solr query string
+     * @param id the url hash of the entry
+     * @throws IOException
+     */
+    public void deleteByQuery(final String querystring) throws IOException;
+
     /**
      * check if a given id exists in solr
      * @param id