diff --git a/modules/fts-solr/src/main/scala/docspell/ftssolr/SolrUpdate.scala b/modules/fts-solr/src/main/scala/docspell/ftssolr/SolrUpdate.scala
index 647ecfdf..ce4a8ed9 100644
--- a/modules/fts-solr/src/main/scala/docspell/ftssolr/SolrUpdate.scala
+++ b/modules/fts-solr/src/main/scala/docspell/ftssolr/SolrUpdate.scala
@@ -37,17 +37,17 @@ object SolrUpdate {
 
       def add(tds: List[TextData]): F[Unit] = {
         val req = Method.POST(tds.asJson, url)
-        client.expect[String](req).map(r => logger.debug(s"Req: $req Response: $r"))
+        client.expect[String](req).map(r => logger.trace(s"Req: $req Response: $r"))
       }
 
       def update(tds: List[TextData]): F[Unit] = {
         val req = Method.POST(tds.filter(minOneChange).map(SetFields).asJson, url)
-        client.expect[String](req).map(r => logger.debug(s"Req: $req Response: $r"))
+        client.expect[String](req).map(r => logger.trace(s"Req: $req Response: $r"))
       }
 
       def delete(q: String): F[Unit] = {
         val req = Method.POST(Delete(q).asJson, url)
-        client.expect[String](req).map(r => logger.debug(s"Req: $req Response: $r"))
+        client.expect[String](req).map(r => logger.trace(s"Req: $req Response: $r"))
       }
 
       private val minOneChange: TextData => Boolean =
diff --git a/modules/joex/src/main/resources/reference.conf b/modules/joex/src/main/resources/reference.conf
index 62b48f99..214f08f5 100644
--- a/modules/joex/src/main/resources/reference.conf
+++ b/modules/joex/src/main/resources/reference.conf
@@ -367,13 +367,25 @@ docspell.joex {
 
   # Configuration of the full-text search engine.
   full-text-search {
+    # The full-text search feature can be disabled. It requires an
+    # additional index server available which needs additional
+    # memory and disk space. It can be enabled later any time.
+    #
+    # Currently the SOLR search platform is supported.
     enabled = false
-    migration = {
-      index-all-chunk = 10
-    }
+
+    # Configuration for the SOLR backend.
     solr = {
       url = "http://localhost:8983/solr/docspell"
       commit-within = 1000
     }
+
+    # Settings for running the index migration tasks
+    migration = {
+      # Chunk size to use when indexing data from the database. This
+      # many attachments are loaded into memory and pushed to the
+      # full-text index.
+      index-all-chunk = 10
+    }
   }
 }
\ No newline at end of file