Implemented serializable doc bits vector for caching on disk.

Change-Id: I5ffdbe429b68b71d165c3ecf5b7504ac01a9a1ec
diff --git a/src/test/resources/named-vc/named-vc2.jsonld b/src/test/resources/named-vc/named-vc2.jsonld
new file mode 100644
index 0000000..be882a0
--- /dev/null
+++ b/src/test/resources/named-vc/named-vc2.jsonld
@@ -0,0 +1,13 @@
+{"collection": {
+    "name" : "named-vc2",
+    "@type": "koral:doc",
+    "key": "textSigle",
+    "match": "match:eq",
+    "type" : "type:string",
+    "value": [
+        "GOE/AGA/02232",
+        "GOE/AGA/02616",
+        "GOE/AGA/03828"
+    ],
+    "cache" : "true"
+}}