update examples

example/nodejs-commonjs/document-persistent/README.md

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+```bash
+npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
+```
+
+```bash
+node index.js
+```

example/nodejs-commonjs/document-persistent/data.json

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+[
+  {
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000003",
+    "titleType": "short",
+    "primaryTitle": "Pauvre Pierrot",
+    "originalTitle": "Pauvre Pierrot",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "4",
+    "genres": [
+      "Animation",
+      "Comedy",
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000004",
+    "titleType": "short",
+    "primaryTitle": "Un bon bock",
+    "originalTitle": "Un bon bock",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "12",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000005",
+    "titleType": "short",
+    "primaryTitle": "Blacksmith Scene",
+    "originalTitle": "Blacksmith Scene",
+    "isAdult": 0,
+    "startYear": "1893",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Comedy",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000006",
+    "titleType": "short",
+    "primaryTitle": "Chinese Opium Den",
+    "originalTitle": "Chinese Opium Den",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000007",
+    "titleType": "short",
+    "primaryTitle": "Corbett and Courtney Before the Kinetograph",
+    "originalTitle": "Corbett and Courtney Before the Kinetograph",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short",
+      "Sport"
+    ]
+  },
+  {
+    "tconst": "tt0000008",
+    "titleType": "short",
+    "primaryTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "originalTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000009",
+    "titleType": "movie",
+    "primaryTitle": "Miss Jerry",
+    "originalTitle": "Miss Jerry",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "45",
+    "genres": [
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000010",
+    "titleType": "short",
+    "primaryTitle": "Leaving the Factory",
+    "originalTitle": "La sortie de l'usine Lumière à Lyon",
+    "isAdult": 0,
+    "startYear": "1895",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  }
+]

example/nodejs-commonjs/document-persistent/index.js

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+const { Document, Charset } = require("flexsearch");
+const Sqlite = require("flexsearch/db/sqlite");
+// const Postgres = require("flexsearch/db/postgres");
+// const MongoDB = require("flexsearch/db/mongodb");
+// const Redis = require("flexsearch/db/redis");
+// const Clickhouse = require("flexsearch/db/clickhouse");
+
+// loading test data
+const data = require(__dirname + "/data.json");
+
+(async function(){
+
+    // create DB instance with namespace
+    const db = new Sqlite("my-store");
+
+    // create the document index
+    const document = new Document({
+        document: {
+            id: "tconst",
+            store: true,
+            index: [{
+                field: "primaryTitle",
+                tokenize: "forward",
+                encoder: Charset.LatinSimple
+            },{
+                field: "originalTitle",
+                tokenize: "forward",
+                encoder: Charset.LatinSimple
+            }],
+            tag: [{
+                field: "startYear"
+            },{
+                field: "genres"
+            }]
+        }
+    });
+
+    // mount database to the index
+    await document.mount(db);
+    // await document.destroy();
+    // await document.mount(db);
+
+    // add test data
+    for(let i = 0; i < data.length; i++){
+        document.add(data[i]);
+    }
+
+    // transfer changes (bulk)
+    await document.commit();
+
+    // perform a query
+    const result = await document.search({
+        query: "carmen",
+        tag: {
+            "startYear": "1894",
+            "genres": [
+                "Documentary",
+                "Short"
+            ]
+        },
+        suggest: true,
+        enrich: true,
+        merge: true
+    });
+
+    console.log(result);
+
+}());

example/nodejs-commonjs/document-persistent/package.json

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+{
+  "name": "nodejs-commonjs-document-persistent",
+  "dependencies": {
+    "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview",
+    "sqlite3": "^5.1.7"
+  }
+}