Builder.php

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<?php
namespace Magento\Elasticsearch\Model\Adapter\Document;

class Builder
{
    private $fields = [];

    public function build()
    {
        $document = [];
        foreach ($this->fields as $field => $value) {
            $document = $this->addFieldToDocument($document, $field, $value);
        }
        $this->clear();
        return $document;
    }

    private function clear()
    {
        $this->fields = [];
    }

    private function addFieldToDocument($document, $field, $value)
    {
        if (is_array($value)) {
            if (count($value) == 0) {
                $document = array_merge($document, [$field => $value]);
            } else {
                $fields = [];
                foreach ($value as $key => $val) {
                    $fields[$field][$key] = $val;
                }
                $document = array_merge($document, $fields);
            }
        } else {
            $field = [$field => $value];
            $document = array_merge($document, $field);
        }
        return $document;
    }

    public function addField($field, $value)
    {
        $this->fields[$field] = $value;
        return $this;
    }

    public function addFields(array $fields)
    {
        $this->fields = array_merge($this->fields, $fields);
        return $this;
    }
}