Improve logs when suggester data could not be created

Author: ahornace

src/org/opensolaris/opengrok/web/api/v1/suggester/provider/service/impl/SuggesterServiceImpl.java

@@ -184,6 +184,10 @@ public void refresh(final String project) {
                     project);
             return;
         }
+        if (!p.isIndexed()) {
+            logger.log(Level.WARNING, "Cannot refresh project {0} because it is not indexed yet", project);
+            return;
+        }
         lock.readLock().lock();
         try {
             if (suggester == null) {

suggester/src/main/java/org/opengrok/suggest/SuggesterProjectData.java

@@ -119,7 +119,9 @@ private void initFields(final Set<String> fields) throws IOException {
             } else if (!indexedFields.containsAll(fields)) {
                 Set<String> copy = new HashSet<>(fields);
                 copy.removeAll(indexedFields);
-                logger.log(Level.WARNING, "Fields {0} will be ignored because they are not indexed", copy);
+                logger.log(Level.WARNING,
+                        "Fields {0} will be ignored because they were not found in index directory {1}",
+                        new Object[] {copy, indexDir});
 
                 copy = new HashSet<>(fields);
                 copy.retainAll(indexedFields);
@@ -346,7 +348,7 @@ public List<Lookup.LookupResult> lookup(final String field, final String prefix,
         try {
             WFSTCompletionLookup lookup = lookups.get(field);
             if (lookup == null) {
-                logger.log(Level.WARNING, "No WFST for field {0}", field);
+                logger.log(Level.WARNING, "No WFST for field {0} in {1}", new Object[] {field, suggesterDir});
                 return Collections.emptyList();
             }
             return lookup.lookup(prefix, false, resultSize);