Angular.json File replacement not working for index.html file

I'm submitting a...

[X] Bug report  

Current behavior

In angular.json build.configuration.fileReplacement does not replace index.html with index.prod.html

Expected behavior

Should replace index.html with index.prod.html similar to how it replaces environment.ts with environment.prod.ts

Minimal reproduction of the problem with instructions

1. Create a new index.prod.html in same directory as original.
2. Update angular.json to replace the original index.html with the new index.prod.html

"configurations": {
                        "production": {
                            "optimization": true,
                            "outputHashing": "all",
                            "sourceMap": false,
                            "extractCss": true,
                            "namedChunks": false,
                            "aot": true,
                            "extractLicenses": true,
                            "vendorChunk": false,
                            "buildOptimizer": true,
                            "fileReplacements": [
                                {
                                    "replace": "src/environments/environment.ts",
                                    "with": "src/environments/environment.prod.ts"
                                },
                                {
                                    "replace": "src/index.html",
                                    "with": "src/index.prod.html"
                                }
                            ]
                        },

What is the motivation / use case for changing the behavior?

Environment

Angular CLI: 6.0.0
Node: 9.8.0
OS: darwin x64
Angular: 6.0.0
... animations, cdk, cli, common, compiler, compiler-cli, core
... forms, http, language-service, material, platform-browser
... platform-browser-dynamic, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.6.0
@angular-devkit/build-angular     0.6.0
@angular-devkit/build-optimizer   0.6.0
@angular-devkit/core              0.6.0
@angular-devkit/schematics        0.6.0 (cli-only)
@angular/flex-layout              6.0.0-beta.15
@ngtools/webpack                  6.0.0
@schematics/angular               0.6.0 (cli-only)
@schematics/update                0.6.0
rxjs                              6.1.0
typescript                        2.7.2
webpack                           4.6.0

Browser:

• Chrome (desktop) version XX

For Tooling issues:

• Node version: v9.8.0
• Platform: Mac

Others:

Seems it's a duplicate of #10881.
Issue is already fixed and is waiting for 6.1 release (I hope so, from comments to issue above).

[filipesilva]

Closing as duplicate of #10881, thanks @pbazurin-softheme 👍

[angular-automatic-lock-bot]

This issue has been automatically locked due to inactivity.
Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}