add yet more log messages, a=chris

diff --git a/lib/index_archive_bundle.php b/lib/index_archive_bundle.php
index 94fa19b7e..22d02eba7 100644
--- a/lib/index_archive_bundle.php
+++ b/lib/index_archive_bundle.php
@@ -242,9 +242,9 @@ class IndexArchiveBundle implements CrawlConstants
         $blocking = false)
     {
         $current_num_docs = $this->getActiveShard()->num_docs;
-        crawlLog("Current shard has ".$current_num_docs." documents.");
+        crawlLog("Current index shard has ".$current_num_docs." documents.");
         $memory_limit = metricToInt(ini_get("memory_limit"));
-        crawlLog("Memory limit is ".$memory_limit.". Usage is ".
+        crawlLog("Memory Indexer limit is ".$memory_limit.". Usage is ".
             memory_get_usage());

         if($current_num_docs + $add_num_docs > $this->num_docs_per_generation
diff --git a/lib/index_shard.php b/lib/index_shard.php
index 2a73c9aaa..6db04a42c 100644
--- a/lib/index_shard.php
+++ b/lib/index_shard.php
@@ -1120,6 +1120,7 @@ class IndexShard extends PersistentStructure implements
         if($this->word_docs_packed) {
             return;
         }
+        crawlLog("Merge index shard postings to string to save memory.");
         ksort($this->words, SORT_STRING);
         $tmp_string = "";
         $offset = 0;
@@ -1194,7 +1195,6 @@ class IndexShard extends PersistentStructure implements
                 $this->word_postings .=
                     $word_id . packInt($word_id_posts_len). $postings;
             }
-            unset($this->words[$word_id]);
             $i++;
         }
         if($tmp_string != "") {