Release indexer version 4.0.0
This MR releases indexer version 4.0.0 with some backwards incompatible changes (in terms of indexer, not for self-managed customers).
After this MR merges the work in gitlab#372873 (closed) can continue
This MR releases indexer version 4.0.0 with some backwards incompatible changes (in terms of indexer, not for self-managed customers).
After this MR merges the work in gitlab#372873 (closed) can continue