Your requirements could not be resolved to an installable set of packages. Problem 1 - Root composer.json requires shopware/elasticsearch 6.6.x-dev (exact version match), found shopware/elasticsearch[dev-trunk, dev-tmp-0f8a0b18cdcc98310776e653ab6219cf6c03b289, dev-tmp-3cb8af229537ecaccce8813e3f45f426a1239160, dev-tmp-6d6122fb8ea07245df048e0a8f7903555ff2fb1b, dev-tmp-82bb32d2eccb4d56557b855dacb1c76414db7be3, dev-tmp-95b44373c930274f67b9af9a954408780c0427fd, dev-tmp-106fe306922e6d86d2ffa6eb49b3bb76b31beb9b, dev-tmp-124ec60fe10aee25ff196c3008d926f9f92586bc, dev-6.0+ea, v6.0.0+ea2, ..., 6.7.x-dev (alias of dev-trunk)] but it does not match the constraint.