Add log message to saveTermEmbeddingsCacheToDb, a=chris

diff --git a/src/library/media_jobs/RecommendationJob.php b/src/library/media_jobs/RecommendationJob.php
index e38edc4ed..152ee2975 100644
--- a/src/library/media_jobs/RecommendationJob.php
+++ b/src/library/media_jobs/RecommendationJob.php
@@ -1320,6 +1320,7 @@ class RecommendationJob extends MediaJob
      */
     public function saveTermEmbeddingsCacheToDb($item_type)
     {
+        L\crawlLog("Doing final persistence flush of LRU cache for $item_type");
         $db = $this->db;
         $base_delete_sql = "DELETE FROM RECOMMENDATION_TERM_EMBEDDING" .
             " WHERE ITEM_TYPE = ? AND ID IN (";