Elasticsearch 8.0 removed support for `interval` in `date_histogram` aggregation types

[Ocramius]

See grafana/grafana#19911

In ElasticSearch 7.2, the interval property was deprecated ( https://www.elastic.co/guide/en/elasticsearch/reference/7.2/search-aggregations-bucket-datehistogram-aggregation.html#_calendar_and_fixed_intervals ):

ElasticsearchDSL/src/Aggregation/Bucketing/DateHistogramAggregation.php

Lines 92 to 111 in b4c3c89

	/**
	* {@inheritdoc}
	*/
	public function getArray()
	{
	if (!$this->getField() || !$this->getInterval()) {
	throw new \LogicException('Date histogram aggregation must have field and interval set.');
	}
	$out = [
	'field' => $this->getField(),
	'interval' => $this->getInterval(),
	];
	if (!empty($this->format)) {
	$out['format'] = $this->format;
	}
	return $out;
	}

Either calendar_interval or fixed_interval should be used instead: https://www.elastic.co/guide/en/elasticsearch/reference/8.0/search-aggregations-bucket-datehistogram-aggregation.html#calendar_and_fixed_intervals

[alexander-schranz]

We are maintaining a fork of this because of some compatibility problems with the original library and merged today 8.x support in it https://github.com/handcraftedinthealps/ElasticsearchDSL/pull/18/files which was provided by @hkulekci.

Maybe that commits can be merged back into this library. Still we continue maintaining the fork for our usages.

/cc @einorler

[malc0mn]

@alexander-schranz thank you very much for that fork, saved the day!