added two virtual instances of solr for the both cores: collection1 and

webgraph. These cores are now accessible at
/solr/collection1/select instead /solr/select?core=collection1
and
/solr/webgraph/select instead /solr/select?core=webgraph
in addition to the old behavior to support compatibility to the old
peers. These new paths are fully solr standard-conform and will allow
the cross-linking between YaCy peers using their public solr API.

source/net/yacy/http/Jetty8HttpServerImpl.java

@@ -134,7 +134,9 @@ public class Jetty8HttpServerImpl implements YaCyHttpServer {
         htrootContext.addServlet(sholder,"/*");    
         
         //add SolrServlet
-        htrootContext.addServlet(SolrServlet.class,"/solr/select");        
+        htrootContext.addServlet(SolrServlet.class, "/solr/select"); // uses the default core, collection1
+        htrootContext.addServlet(SolrServlet.class, "/solr/collection1/select"); // the same servlet, identifies the collection1 core using the path
+        htrootContext.addServlet(SolrServlet.class, "/solr/webgraph/select"); // the same servlet, identifies the webgraph core using the path
 
         // add proxy?url= servlet
         htrootContext.addServlet(YaCyProxyServlet.class,"/proxy.html");

source/net/yacy/http/servlets/SolrServlet.java

@@ -192,7 +192,8 @@ public class SolrServlet extends HttpServlet {
             }
 
             // get the embedded connector
-            boolean defaultConnector = mmsp.get("core", CollectionSchema.CORE_NAME).equals(CollectionSchema.CORE_NAME);
+            String requestURI = hrequest.getRequestURI();
+            boolean defaultConnector = (requestURI.startsWith("/solr/" + WebgraphSchema.CORE_NAME)) ? false : requestURI.startsWith("/solr/" + CollectionSchema.CORE_NAME) || mmsp.get("core", CollectionSchema.CORE_NAME).equals(CollectionSchema.CORE_NAME);
             mmsp.getMap().remove("core");
             EmbeddedSolrConnector connector = defaultConnector ? sb.index.fulltext().getDefaultEmbeddedConnector() : sb.index.fulltext().getEmbeddedConnector(WebgraphSchema.CORE_NAME);
             if (connector == null) throw new ServletException("no core");