We are currently using a premature version of ES 0.16 in production. Size is 200GB.
We would like to upgrade to 5.0.
The documentation states that we need to upgrade per Major Release :
0.16 -> 0.90
0.90 -> 1.7
1.4 -> 2.4
2.4 -> 5.0
Our current environment is a cluster of 2 machines. The gateway is file-based and not local.
I've installed already a 0.90 version next to the 0.16 version, copied the data block to the 0.90 home, and started the 0.90 engine. But I receive errors that file-based gateway is not supported anymore. When I change the setting to local gateway, ES starts up fine, but ES doesn't find the indices.
Do you have any idea how this can be solved ? Complete reindexation is not an option.