composer.json: Support version ^6.0.0 for elasticsearch (#26)
composer.json: Support version ^6.0.0 for elasticsearch (#26)

* composer.json: Support version ^6.0.0 for elasticsearch

Allow use of the bundle for ElasticSearch/ElasticSearch 6.0.0 and higher

* composer.json: update pipe syntax to the OR operator

M6Web/ElasticsearchBundle,M6Web/ElasticsearchBundle