_grokparsefailure, _geoip_lookup_failure with _reindex

Hello,

after migrate my indeces with an _reindex with this script :

for i in cat index_list.txt
do
echo $i
curl -XPOST [DESTINATION]:9200/_reindex?pretty -d '{ "source": { "remote": { "host": "http://[SOURCE]:9200" }, "index": "'$i'" }, "dest": { "index": "'$i'" }}'
done

I have an _grokparsefailure, _geoip_lookup_failure on new cluster, how reindex the new indeces with the good (old) grok ?

Thanks

Please don't cross-post. This is a duplicate of

But in french.

Read this and specifically the "Also be patient" part.