Can't add a filter on a text search

[fullbl]

Bug Report

Q	A
BC Break	yes
Version	5.0.1

Summary

When adding a filter, it goes always in first stage. If the query already have a match two stages will be created, making mongodb throw an exception.
Documentation states that $match stage that includes a $text must be the first stage in the pipeline.

Current behavior

The stage that comes from filters will always be the first in pipeline.

How to reproduce

1. create a filter

final class ExcludeSoftDeletedFilter extends BsonFilter
{
    public function addFilterCriteria(ClassMetadata $targetDocument): array
    {
        return [
            'deletedAt' => null,
        ];
    }
}

2. run a query with texts:

$this->createAggregationBuilder()
            ->match()
            ->field('field')
            ->text('value')

An exception occured, transforming to an Error resource. {"exception":"[object] (MongoDB\\Driver\\Exception\\CommandException(code: 17313): $match with $text is only allowed as the first pipeline stage at /var/www/html/vendor/mongodb/mongodb/src/Operation/Aggregate.php:383

Expected behavior

In my opinion, the CriteriaMerger should be used when merging the attributes, or there should be a "reorder" before submitting the query, so the text stage should go first

[GromNaN]

It seems that we need to apply the same kind of logic that we already have with $geoNear:

mongodb-odm/lib/Doctrine/ODM/MongoDB/Aggregation/Builder.php

Lines 267 to 270 in 402efbd

	* For pipelines where the first stage is a $geoNear stage, it will apply
	* the document filters and discriminator queries to the query portion of
	* the geoNear operation. For all other pipelines, it prepends a $match stage
	* containing the required query.

[fullbl]

Something like this would work, don't know if it's optimal (I'm pretty new to mongodb):

$matchExpression = $this->applyFilters([]);
        if ($matchExpression !== []) {
            if ($this->getStage(0) instanceof Stage\MatchStage) {
                $merger = new CriteriaMerger;
                $pipeline[0]['$match'] = $merger->merge($pipeline[0]['$match'], $matchExpression);

                return $pipeline;
            }
            array_unshift($pipeline, ['$match' => $matchExpression]);
        }