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CLM 403 to 502 need reindexing and rebuildall

I am in a process of upgrading the CLM from 403 to 502. I read some where to run the following commands
./repotools-jts.sh -rebuildIndices
./repotools-jts.sh -rebuildTextIndices
./repotools-jts.sh -reindex all
./repotools-ccm.sh -rebuildIndices
./repotools-ccm.sh -rebuildTextIndices
./repotools-ccm.sh -reindex all
./repotools-qm.sh -rebuildIndices
./repotools-qm.sh -rebuildTextIndices
./repotools-qm.sh -reindex all
Are those commands need to run for upgrade? I followed the infocenter technotes for ugprade but it did not mentioned anything on it. If we are using japan and china language then need to reindex. Do we need to run above commands even If we are not using those languages ?
Thanks
Accepted answer

Only for Chinese and Japanese languages upgrading from 4.0.2 or earlier: Rebuild text indices Back to top
In version 4.0.3 and later, full text search has been significantly improved for Chinese and Japanese languages. To take advantage of this improvement, do these steps: [ details omitted ]
We did not do the rebuildTextIndices or reindex when upgrading from 4.0.7 to 5.0.2. The -rebuildTextIndices will add hours to your upgrade time.