diff --git a/packages/full-text-search-language/spec/helper/create_lanuage_test.ts b/packages/full-text-search-language/spec/helper/create_lanuage_test.ts
index 13affcd2..ecf02f40 100644
--- a/packages/full-text-search-language/spec/helper/create_lanuage_test.ts
+++ b/packages/full-text-search-language/spec/helper/create_lanuage_test.ts
@@ -31,7 +31,7 @@ export function createLanguageTest(language: string, data: LanguageTestData) {
     let fts = new FullTextSearch([{
       name: "body",
       tokenizer: data.tokenizer
-    }]);
+    }], "$loki");
 
     // Add documents.
     for (let i = 0; i < data.docs.length; i++) {
diff --git a/packages/full-text-search/spec/generic/search/fuzzy.spec.ts b/packages/full-text-search/spec/generic/search/fuzzy.spec.ts
index f79fe150..72e4faa4 100644
--- a/packages/full-text-search/spec/generic/search/fuzzy.spec.ts
+++ b/packages/full-text-search/spec/generic/search/fuzzy.spec.ts
@@ -37,7 +37,7 @@ describe("fuzzy query", () => {
 
   it("Fuzzy query (1).", () => {
     let docs = ["aaaaa", "aaaab", "aaabb", "aabbb", "abbbb", "bbbbb", "ddddd"];
-    let fts = new FullTextSearch([{name: "body"}]);
+    let fts = new FullTextSearch([{name: "body"}], "$loki");
     for (let i = 0; i < docs.length; i++) {
       fts.addDocument({
         $loki: i,
@@ -141,7 +141,7 @@ describe("fuzzy query", () => {
   it("Fuzzy query (2).", () => {
     let docs = ["lange", "lueth", "pirsing", "riegel", "trzecziak", "walker", "wbr", "we", "web", "webe", "weber",
       "webere", "webree", "weberei", "wbre", "wittkopf", "wojnarowski", "wricke"];
-    let fts = new FullTextSearch([{name: "body"}]);
+    let fts = new FullTextSearch([{name: "body"}], "$loki");
     for (let i = 0; i < docs.length; i++) {
       fts.addDocument({
         $loki: i,
@@ -164,7 +164,7 @@ describe("fuzzy query", () => {
       return tokens.split(" ");
     });
 
-    let fts = new FullTextSearch([{name: "body", tokenizer: tkz}]);
+    let fts = new FullTextSearch([{name: "body", tokenizer: tkz}], "$loki");
     for (let i = 0; i < docs.length; i++) {
       fts.addDocument({
         $loki: i,
@@ -178,7 +178,7 @@ describe("fuzzy query", () => {
   it("Fuzzy query extended.", () => {
     let docs = ["walker", "wbr", "we", "web", "webe", "weber", "webere", "webree", "weberei", "wbes", "wbert", "wbb",
       "xeb", "wrr", "wrr"];
-    let fts = new FullTextSearch([{name: "body"}]);
+    let fts = new FullTextSearch([{name: "body"}], "$loki");
     for (let i = 0; i < docs.length; i++) {
       fts.addDocument({
         $loki: i,
@@ -195,7 +195,7 @@ describe("fuzzy query", () => {
 
   it("Fuzzy query extended.", () => {
     let docs = ["abca", "abcd", "abcde"];
-    let fts = new FullTextSearch([{name: "body"}]);
+    let fts = new FullTextSearch([{name: "body"}], "$loki");
     for (let i = 0; i < docs.length; i++) {
       fts.addDocument({
         $loki: i,
diff --git a/packages/full-text-search/spec/generic/search/wildcard.spec.ts b/packages/full-text-search/spec/generic/search/wildcard.spec.ts
index 27d2293f..a2a2c16f 100644
--- a/packages/full-text-search/spec/generic/search/wildcard.spec.ts
+++ b/packages/full-text-search/spec/generic/search/wildcard.spec.ts
@@ -22,7 +22,7 @@ describe("wildcard query", () => {
 
   it("Tests Wildcard queries with an asterisk.", () => {
     let docs = ["metal", "metals", "mXtals", "mXtXls"];
-    let fts = new FullTextSearch([{name: "body"}]);
+    let fts = new FullTextSearch([{name: "body"}], "$loki");
     for (let i = 0; i < docs.length; i++) {
       fts.addDocument({
         $loki: i,
@@ -56,7 +56,7 @@ describe("wildcard query", () => {
 
   it("Tests Wildcard queries with a question mark.", () => {
     let docs = ["metal", "metals", "mXtals", "mXtXls"];
-    let fts = new FullTextSearch([{name: "body"}]);
+    let fts = new FullTextSearch([{name: "body"}], "$loki");
     for (let i = 0; i < docs.length; i++) {
       fts.addDocument({
         $loki: i,
@@ -85,7 +85,7 @@ describe("wildcard query", () => {
     // Don't split the text.
     tkz.setSplitter("nosplit", (text) => [text]);
 
-    let fts = new FullTextSearch([{name: "body", tokenizer: tkz}]);
+    let fts = new FullTextSearch([{name: "body", tokenizer: tkz}], "$loki");
     for (let i = 0; i < docs.length; i++) {
       fts.addDocument({
         $loki: i,
diff --git a/packages/full-text-search/spec/node/elasticsearch.spec.ts b/packages/full-text-search/spec/node/elasticsearch.spec.ts
index c2c04600..ca9c9df2 100644
--- a/packages/full-text-search/spec/node/elasticsearch.spec.ts
+++ b/packages/full-text-search/spec/node/elasticsearch.spec.ts
@@ -269,7 +269,7 @@ describe("Compare scoring against elasticsearch", () => {
     let fts = new FullTextSearch([{
       name: FIELD_NAME_1,
       tokenizer: tkz
-    }]);
+    }], "$loki");
 
     // Add documents.
     for (let i = 0; i < DATA.length; i++) {
diff --git a/packages/full-text-search/src/full_text_search.ts b/packages/full-text-search/src/full_text_search.ts
index c8755c9a..716ba28f 100644
--- a/packages/full-text-search/src/full_text_search.ts
+++ b/packages/full-text-search/src/full_text_search.ts
@@ -28,9 +28,9 @@ export class FullTextSearch {
    * @param {boolean=true} fields.optimizeChanges - flag to indicate if deleting/updating a document should be optimized
    *  (requires more memory but performs better)
    * @param {Tokenizer=Tokenizer} fields.tokenizer - the tokenizer of the field
-   * @param {string=$loki} id - the property name of the document index
+   * @param {string} [id] - the property name of the document index
    */
-  constructor(fields: FullTextSearch.FieldOptions[] = [], id = "$loki") {
+  constructor(fields: FullTextSearch.FieldOptions[] = [], id?: string) {
     // Create inverted indices for each field.
     for (let i = 0; i < fields.length; i++) {
       let field = fields[i];