I have an active Elastic Search cluster v5.2.2 that I am currently using.
We are planning to migrate ES to 6.1.1.
While the older version was installed using rpm file, we installed the new version using tar file.
I have copied the data folder from older version to new version (new version will be installed on different machines) without shutting down the old cluster. Data size is around 800GB which took around 1 hour to copy.
All the indices of older cluster have been detected in the new cluster, but the data in those indices is completely missing.
Logs continuously show the following warning:
[[INDEX_NAME]] can not be imported as a dangling index, as index with same name already exists in cluster metadata
Please help why the data is missing in the newer version.
Thanks in advance.