Can't populate the index with correct data

[a1tem]

Hello, thank you for your package it's awesome.

I have created database\mappings\app_models_knowledgebase.php

And put there:

<?php

use Sleimanx2\Plastic\Facades\Map;
use Sleimanx2\Plastic\Map\Blueprint;
use Sleimanx2\Plastic\Mappings\Mapping;

class AppModelsKnowledgeBase extends Mapping
{
    /**
     * Full name of the model that should be mapped
     *
     * @var string
     */
    protected $model = App\Models\KnowledgeBase\KnowledgeBase::class;

    /**
     * Run the mapping.
     *
     * @return void
     */
    public function map()
    {
        Map::create($this->getModelType(), function(Blueprint $map){
            $map->string('title');
            $map->string('content');
            $map->string('status');
            $map->nested('tags', function (Blueprint $map) {
                $map->integer('id');
                $map->string('name');
            });
        }, $this->getModelIndex());
    }
}

Also within my model I have:

    public function buildDocument()
    {
        return [
            'title' => $this->title,
            'content' => $this->content,
            'tags' => $this->tags,
            'status' => $this->status,
        ];
    }

    /**
     * Add tags attribute
     *
     * @return \Illuminate\Database\Eloquent\Collection
     */
    public function getTagsAttribute()
    {
        return $this->tags()->get();
    }

    /**
     * Get all of the tags for the article.
     */
    public function tags()
    {
        return $this->morphToMany(
            Tag::class,
            TagRelation::RELATION_NAME,
            TagRelation::TABLE_NAME
        );
    }

So question is how can I populate data,
when I run

artisan plastic:populate --mappings

it says:

Index « test » does not exists.

And if I try to index document before

$knowledgeBase->document()->save(); 

so then when I run

artisan mapping:rerun 

it says:

Elasticsearch\Common\Exceptions\BadRequest400Exception  : {"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"object mapping [tags] can't be changed from non-nested to nested"}],"type":"illegal_argument_exception","reason":"object mapping [tags] can't be changed from non-nested to nested"},"status":400}

[xotrs]

Try
Use Object Instead to Nested