Protect schema migrations from running in parallel #199
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eikek
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For code that should not run in parallel when multiple deployments are active, synchronisation must happen outside the app. For this SOLR can be used, utilising it's optimistic locking feature. Based on this, a `Resource` is provided to be able to run code sequentially.
Re-indexing must not run in parallel, so it was protected by inserting something into solr. Now this can be replaced with the `DocumentLockResource`.
Running schema migrations must not happen in parallel, should there be multiple instance deployed. It is now protected using the `DocumentLockResource`. Since this changes the version-document used to track the current schema version, this document must now be converted as a first step to make it up to date on existing deployments.
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