Error while reindexing from old index to new

I am getting the following error while reindexing my data from old to new indices.

{"index":"XXXX-2019.02.01","type":"doc","id":"YYYY","cause":{"type":"mapper_parsing_exception","reason":"failed to parse [timestamp]","caused_by":{"type":"illegal_argument_exception","reason":"Invalid format: \\"Feb  1 03:35:47\\""}},"status":400}]}')

Any help would be appreciated.

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