Manual.php

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<?php
namespace Magento\Catalog\Model\Layer\Filter\Dynamic;

use Magento\Catalog\Model\Layer\Filter\Price\Range;
use Magento\Catalog\Model\Layer\Filter\Price\Render;
use Magento\Catalog\Model\Layer\Resolver;
use Magento\Catalog\Model\ResourceModel\Layer\Filter\Price;
use Magento\Framework\App\Config\ScopeConfigInterface;
use Magento\Framework\Registry;
use Magento\Framework\Search\Dynamic\Algorithm;
use Magento\Store\Model\ScopeInterface;

class Manual implements AlgorithmInterface
{
    const XML_PATH_RANGE_MAX_INTERVALS = 'catalog/layered_navigation/price_range_max_intervals';

    public function __construct(
        Algorithm $algorithm,
        Resolver $layerResolver,
        ScopeConfigInterface $scopeConfig,
        Render $render,
        Registry $coreRegistry,
        Price $resource,
        Range $range
    ) {
        $this->algorithm = $algorithm;
        $this->layer = $layerResolver->get();
        $this->scopeConfig = $scopeConfig;
        $this->render = $render;
        $this->coreRegistry = $coreRegistry;
        $this->range = $range;
        $this->resource = $resource;
    }

    public function getItemsData(array $intervals = [], $additionalRequestData = '')
    {
        $data = [];
        if (empty($intervals)) {
            $range = $this->range->getPriceRange();
            if (!$range) {
                $range = $this->range->getConfigRangeStep();
                $dbRanges = $this->resource->getCount($range);
                $dbRanges = $this->processRange($dbRanges);
                $data = $this->render->renderRangeData($range, $dbRanges);
            }
        }

        return $data;
    }

    private function processRange($items)
    {
        $i = 0;
        $lastIndex = null;
        $maxIntervalsNumber = $this->getMaxIntervalsNumber();
        foreach ($items as $k => $v) {
            ++$i;
            if ($i > 1 && $i > $maxIntervalsNumber) {
                $items[$lastIndex] += $v;
                unset($items[$k]);
            } else {
                $lastIndex = $k;
            }
        }
        return $items;
    }

    public function getMaxIntervalsNumber()
    {
        return (int)$this->scopeConfig->getValue(
            self::XML_PATH_RANGE_MAX_INTERVALS,
            ScopeInterface::SCOPE_STORE
        );
    }
}