diff --git a/htroot/IndexReIndexMonitor_p.html b/htroot/IndexReIndexMonitor_p.html
index bf53426d6..3ef32d53e 100644
--- a/htroot/IndexReIndexMonitor_p.html
+++ b/htroot/IndexReIndexMonitor_p.html
@@ -73,6 +73,9 @@
             <div class="form-group">
             	<label>Include failed URLs <input type="checkbox" name="includefailedurls" #(includefailedurls)#::checked="checked"#(/includefailedurls)# /></label>
             </div>
+            <div class="form-group">
+              <label>Delete URLs <input type="checkbox" name="deleteOnRecrawl" #(deleteOnRecrawl)#::checked="checked"#(/deleteOnRecrawl)# /></label>
+            </div>
             <input type="submit" name="recrawlDefaults" value="Set defaults" class="btn btn-default" title="Reset to default values"/>
             <input type="submit" name="recrawlnow" value="start recrawl job now" class="btn btn-primary"/>
             to re-crawl documents selected with the given query.
@@ -91,6 +94,9 @@
               <div class="form-group">
               	<label>Include failed urls <input type="checkbox" name="includefailedurls" onchange="this.form.submit()" #(includefailedurls)#::checked="checked"#(/includefailedurls)# /></label>
               </div>
+              <div class="form-group">
+                <label>Delete urls <input type="checkbox" name="deleteOnRecrawl" onchange="this.form.submit()" #(deleteOnRecrawl)#::checked="checked"#(/deleteOnRecrawl)# /></label>
+              </div>
               <input type="submit" name="stoprecrawl" value="stop recrawl job" class="btn btn-danger"/>
             </fieldset>
           #(/recrawljobrunning)#
diff --git a/htroot/IndexReIndexMonitor_p.java b/htroot/IndexReIndexMonitor_p.java
index 71c9eceed..80ed6f0a6 100644
--- a/htroot/IndexReIndexMonitor_p.java
+++ b/htroot/IndexReIndexMonitor_p.java
@@ -123,6 +123,7 @@ public class IndexReIndexMonitor_p {
         
     	String recrawlQuery = RecrawlBusyThread.DEFAULT_QUERY;
         boolean inclerrdoc = RecrawlBusyThread.DEFAULT_INCLUDE_FAILED;
+        boolean deleteOnRecrawl = RecrawlBusyThread.DEFAULT_DELETE_ON_RECRAWL;
         // to signal that a setting shall change the form provides a fixed parameter setup=recrawljob, if not present return status only
         if (post != null && "recrawljob".equals(post.get("setup"))) { // it's a command to recrawlThread
         	
@@ -136,13 +137,17 @@ public class IndexReIndexMonitor_p {
             if (post.containsKey("includefailedurls")) {
                 inclerrdoc = post.getBoolean("includefailedurls");
             }
+            
+            if (post.containsKey("deleteOnRecrawl")) {
+                deleteOnRecrawl = post.getBoolean("deleteOnRecrawl");
+            }
 
             if (recrawlbt == null || recrawlbt.shutdownInProgress()) {
                 prop.put("recrawljobrunning_simulationResult", 0);
                 prop.put("recrawljobrunning_error", 0);
             	if (post.containsKey("recrawlnow")) {
             		sb.deployThread(RecrawlBusyThread.THREAD_NAME, "ReCrawl", "recrawl existing documents", null,
-            				new RecrawlBusyThread(Switchboard.getSwitchboard(), recrawlQuery, inclerrdoc), 1000);
+            				new RecrawlBusyThread(Switchboard.getSwitchboard(), recrawlQuery, inclerrdoc, deleteOnRecrawl), 1000);
             		recrawlbt = sb.getThread(RecrawlBusyThread.THREAD_NAME);
                 
             		/* store this call as an api call for easy scheduling possibility */
@@ -192,6 +197,7 @@ public class IndexReIndexMonitor_p {
                 if(post.containsKey("recrawlDefaults")) {
                 	recrawlQuery = RecrawlBusyThread.DEFAULT_QUERY;
                     inclerrdoc = RecrawlBusyThread.DEFAULT_INCLUDE_FAILED;
+                    deleteOnRecrawl = RecrawlBusyThread.DEFAULT_DELETE_ON_RECRAWL;
                 }
             } else {
                 if (post.containsKey("stoprecrawl")) {
@@ -204,9 +210,10 @@ public class IndexReIndexMonitor_p {
 
             if (recrawlbt != null && !recrawlbt.shutdownInProgress()) {
                 if (post.containsKey("updquery") && post.containsKey("recrawlquerytext")) {
-                    ((RecrawlBusyThread) recrawlbt).setQuery(recrawlQuery, inclerrdoc);
+                    ((RecrawlBusyThread) recrawlbt).setQuery(recrawlQuery, inclerrdoc, deleteOnRecrawl);
                 } else {
                     ((RecrawlBusyThread) recrawlbt).setIncludeFailed(inclerrdoc);
+                    ((RecrawlBusyThread) recrawlbt).setDeleteOnRecrawl(deleteOnRecrawl);
                 }
             }
         }
@@ -219,10 +226,12 @@ public class IndexReIndexMonitor_p {
             prop.put("recrawljobrunning_docCount", ((RecrawlBusyThread) recrawlbt).getUrlsToRecrawl());
             prop.put("recrawljobrunning_recrawlquerytext", ((RecrawlBusyThread) recrawlbt).getQuery());
             prop.put("recrawljobrunning_includefailedurls", ((RecrawlBusyThread) recrawlbt).getIncludeFailed());
+            prop.put("recrawljobrunning_deleteOnRecrawl", ((RecrawlBusyThread) recrawlbt).getDeleteOnRecrawl());
         } else {
 			prop.put("recrawljobrunning", 0);
             prop.put("recrawljobrunning_recrawlquerytext", recrawlQuery);
             prop.put("recrawljobrunning_includefailedurls", inclerrdoc);
+            prop.put("recrawljobrunning_deleteOnRecrawl", deleteOnRecrawl);
         }
 
         // return rewrite properties
diff --git a/source/net/yacy/crawler/RecrawlBusyThread.java b/source/net/yacy/crawler/RecrawlBusyThread.java
index c658834ab..3a214a8be 100644
--- a/source/net/yacy/crawler/RecrawlBusyThread.java
+++ b/source/net/yacy/crawler/RecrawlBusyThread.java
@@ -26,8 +26,10 @@ package net.yacy.crawler;
 import java.io.IOException;
 import java.net.MalformedURLException;
 import java.time.LocalDateTime;
+import java.util.ArrayList;
 import java.util.Date;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Set;
 
 import org.apache.solr.common.SolrDocument;
@@ -44,7 +46,6 @@ import net.yacy.crawler.data.NoticedURL;
 import net.yacy.crawler.retrieval.Request;
 import net.yacy.kelondro.workflow.AbstractBusyThread;
 import net.yacy.search.Switchboard;
-import net.yacy.search.SwitchboardConstants;
 import net.yacy.search.schema.CollectionSchema;
 
 /**
@@ -64,6 +65,9 @@ public class RecrawlBusyThread extends AbstractBusyThread {
     
     /** Default value for inclusion or not of documents with a https status different from 200 (success) */
     public static final boolean DEFAULT_INCLUDE_FAILED = false;
+    
+    /** The default value whether to delete on Recrawl */
+    public static final boolean DEFAULT_DELETE_ON_RECRAWL = false;
 
     /** The current query selecting documents to recrawl */
     private String currentQuery;
@@ -71,6 +75,9 @@ public class RecrawlBusyThread extends AbstractBusyThread {
     /** flag if docs with httpstatus_i <> 200 shall be recrawled */
     private boolean includefailed;
     
+    /** flag whether to delete on Recrawl */
+    private boolean deleteOnRecrawl;
+    
     private int chunkstart = 0;
     private final int chunksize = 100;
     private final Switchboard sb;
@@ -116,16 +123,17 @@ public class RecrawlBusyThread extends AbstractBusyThread {
 	 *            set to true when documents with a https status different from 200
 	 *            (success) must be included
 	 */
-    public RecrawlBusyThread(final Switchboard xsb, final String query, final boolean includeFailed) {
+    public RecrawlBusyThread(final Switchboard xsb, final String query, final boolean includeFailed, final boolean deleteOnRecrawl) {
         super(3000, 1000); // set lower limits of cycle delay
         setName(THREAD_NAME);
         this.setIdleSleep(10*60000); // set actual cycle delays
         this.setBusySleep(2*60000);
         this.setPriority(Thread.MIN_PRIORITY);
-
+        this.setLoadPreReqisite(1);
         this.sb = xsb;
         this.currentQuery = query;
         this.includefailed = includeFailed;
+        this.deleteOnRecrawl = deleteOnRecrawl;
         this.urlstack = new HashSet<DigestURL>();
         // workaround to prevent solr exception on existing index (not fully reindexed) since intro of schema with docvalues
         // org.apache.solr.core.SolrCore java.lang.IllegalStateException: unexpected docvalues type NONE for field 'load_date_dt' (expected=NUMERIC). Use UninvertingReader or index with docvalues.
@@ -143,10 +151,12 @@ public class RecrawlBusyThread extends AbstractBusyThread {
      * and resets the counter to start a fresh query loop
      * @param q select query
      * @param includefailedurls true=all http status docs are recrawled, false=httpstatus=200 docs are recrawled
+     * @param deleteOnRecrawl
      */
-    public void setQuery(String q, boolean includefailedurls) {
+    public void setQuery(String q, boolean includefailedurls, final boolean deleteOnRecrawl) {
         this.currentQuery = q;
         this.includefailed = includefailedurls;
+        this.deleteOnRecrawl = deleteOnRecrawl;
         this.chunkstart = 0;
     }
 
@@ -180,6 +190,14 @@ public class RecrawlBusyThread extends AbstractBusyThread {
     public boolean getIncludeFailed () {
         return this.includefailed;
     }
+    
+    public void setDeleteOnRecrawl(final boolean deleteOnRecrawl) {
+        this.deleteOnRecrawl = deleteOnRecrawl;
+    }
+    
+    public boolean getDeleteOnRecrawl() {
+        return this.deleteOnRecrawl;
+    }
 
     /**
      * feed urls to the local crawler
@@ -290,21 +308,27 @@ public class RecrawlBusyThread extends AbstractBusyThread {
         }
 
         if (docList != null) {
+            List<String> tobedeletedIDs = new ArrayList<>();
             for (final SolrDocument doc : docList) {
                 try {
                     this.urlstack.add(new DigestURL((String) doc.getFieldValue(CollectionSchema.sku.getSolrFieldName())));
+                    if (deleteOnRecrawl) tobedeletedIDs.add((String) doc.getFieldValue(CollectionSchema.id.getSolrFieldName()));
                 } catch (final MalformedURLException ex) {
                 	this.malformedUrlsCount++;
-                    try { // if index entry hasn't a valid url (useless), delete it
-                        solrConnector.deleteById((String) doc.getFieldValue(CollectionSchema.id.getSolrFieldName()));
-                        this.malformedUrlsDeletedCount++;
-                        ConcurrentLog.severe(THREAD_NAME, "deleted index document with invalid url " + (String) doc.getFieldValue(CollectionSchema.sku.getSolrFieldName()));
-                    } catch (final IOException ex1) {
-                        ConcurrentLog.severe(THREAD_NAME, ex1.getMessage());
-                    }
+                    // if index entry hasn't a valid url (useless), delete it
+                    tobedeletedIDs.add((String) doc.getFieldValue(CollectionSchema.id.getSolrFieldName()));
+                    this.malformedUrlsDeletedCount++;
+                    ConcurrentLog.severe(THREAD_NAME, "deleted index document with invalid url " + (String) doc.getFieldValue(CollectionSchema.sku.getSolrFieldName()));
                 }
             }
-            this.chunkstart = this.chunkstart + this.chunksize;
+            
+            if (!tobedeletedIDs.isEmpty()) try {
+                solrConnector.deleteByIds(tobedeletedIDs);
+            } catch (IOException e) {
+                ConcurrentLog.severe(THREAD_NAME, "error deleting IDs ", e);
+            }
+            
+            this.chunkstart = deleteOnRecrawl? 0 : this.chunkstart + this.chunksize;
         }
         
         if (docList == null || docList.size() < this.chunksize) {