Fastest way to reindex from 2.3 to 6.4

Hi
we have 300TB indices 2.3.5 and we want to upgrade to elasticsearch 6.3.

we set refresh interval to -1
replica to 0
request_per_second to -1
and we run 10 remote reindex API on 3 coordinator node.
our tests show that it will be converted over 3 month.
how can we decrease the reindex time?
any suggestion will be appreciated.

not use the default api.
use java client search the es 2.3 data and use bulk to write to the new 6.3 es cluster

1 Like

we increase the bulk size and had better performance.

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