adapt SolrServerConnector.add to handle error on partial update input document.

In case of error we deleted the original document and added the new doc to the index.
This is not valid for partial update documents (which contain only a subset of the fields).
Remove the "delete" error handling step.

source/net/yacy/cora/federate/solr/connector/SolrServerConnector.java

@@ -216,11 +216,14 @@ public abstract class SolrServerConnector extends AbstractSolrConnector implemen
                 clearCaches(); // prevent further OOM if this was caused by OOM
                 ConcurrentLog.logException(e);
                 // catches "version conflict for": try this again and delete the document in advance
+                /*
+                // with possible partial update docs, don't try to delete index doc and reinsert solrdoc
+                // as this would result in a index doc with just the updated fields
                 try {
                     this.server.deleteById((String) solrdoc.getFieldValue(CollectionSchema.id.getSolrFieldName()));
                 } catch (final SolrServerException e1) {
                     ConcurrentLog.logException(e1);
-                }
+                }*/
                 try {
                     this.server.add(solrdoc, -1);
                 } catch (final Throwable ee) {
@@ -255,13 +258,17 @@ public abstract class SolrServerConnector extends AbstractSolrConnector implemen
                 clearCaches(); // prevent further OOM if this was caused by OOM
                 ConcurrentLog.logException(e);
                 // catches "version conflict for": try this again and delete the document in advance
+                /*
+                // with possible partial update docs, don't try to delete index doc and reinsert solrdoc
+                // as this would result in a index doc with just the updated fields
+
                 List<String> ids = new ArrayList<String>();
                 for (SolrInputDocument solrdoc : solrdocs) ids.add((String) solrdoc.getFieldValue(CollectionSchema.id.getSolrFieldName()));
                 try {
                     this.server.deleteById(ids);
                 } catch (final SolrServerException e1) {
                     ConcurrentLog.logException(e1);
-                }
+                }*/
                 try {
                     this.server.commit();
                 } catch (final Throwable eee) {
@@ -272,6 +279,8 @@ public abstract class SolrServerConnector extends AbstractSolrConnector implemen
                     this.server.add(solrdocs, -1);
                 } catch (final Throwable ee) {
                     ConcurrentLog.logException(ee);
+                    List<String> ids = new ArrayList<String>();
+                    for (SolrInputDocument solrdoc : solrdocs) ids.add((String) solrdoc.getFieldValue(CollectionSchema.id.getSolrFieldName()));
                     log.warn(e.getMessage() + " IDs=" + ids.toString());
                     throw new IOException(ee);
                 }