force replace a bad link in generated docs

docs/api_methods.asciidoc

@@ -3694,7 +3694,7 @@ client.indices.flushSynced([params, [callback]])
 
 // no description
 
-Check the *<<api-conventions>>* and https://www.elastic.co/guide/en/elasticsearch/reference/7.4/indices-flush.html#synced-flush-api[the elasticsearch docs] for more information pertaining to this method.
+Check the *<<api-conventions>>* and https://www.elastic.co/guide/en/elasticsearch/reference/7.4/indices-synced-flush-api.html[the elasticsearch docs] for more information pertaining to this method.
 
 // no examples
 
@@ -3717,7 +3717,7 @@ Options:::
 `index`::
 <<api-param-type-string,`String`>>, <<api-param-type-string-array,`String[]`>>, <<api-param-type-boolean,`Boolean`>> -- A comma-separated list of index names; use `_all` or empty string for all indices
 `body`::
-<<api-param-type-object,`Object`>>, <<api-param-type-json,`JSON`>> -- An optional request body, as either JSON or a JSON serializable object. See https://www.elastic.co/guide/en/elasticsearch/reference/7.4/indices-flush.html#synced-flush-api[the elasticsearch docs] for details about what can be specified here.
+<<api-param-type-object,`Object`>>, <<api-param-type-json,`JSON`>> -- An optional request body, as either JSON or a JSON serializable object. See https://www.elastic.co/guide/en/elasticsearch/reference/7.4/indices-synced-flush-api.html[the elasticsearch docs] for details about what can be specified here.
 
 link:#[back to top]
 

scripts/generate/js_api.js

@@ -188,9 +188,20 @@ module.exports = function(branch, done) {
     done();
   }
 
+  var patchBadLinks = {
+    'https://www.elastic.co/guide/en/elasticsearch/reference/7.4/indices-flush.html#synced-flush-api':
+      'https://www.elastic.co/guide/en/elasticsearch/reference/7.4/indices-synced-flush-api.html',
+  };
+
   function writeMethodDocs(done) {
     var filename = fromRoot('docs/api_methods' + branchSuffix + '.asciidoc');
-    fs.writeFile(filename, templates.apiMethods(docVars), function(err) {
+    var content = templates.apiMethods(docVars);
+
+    for (const [bad, good] of Object.entries(patchBadLinks)) {
+      content = content.split(bad).join(good);
+    }
+
+    fs.writeFile(filename, content, function(err) {
       if (!err) {
         console.log(
           chalk.white.bold('wrote'),