Getting error while migrating indexes from 5.6 to 6.3.0

Executing steps via

First step is complete, when trying to exeute second step getting following error, if i validate json via tool its fine. Please assist:

{"error":{"root_cause":[{"type":"parse_exception","reason":"Failed to parse content to map"}],"type":"parse_exception","reason":"Failed to parse content to map","caused_by":{"type":"json_parse_exception","reason":"Illegal unquoted character ((CTRL-CHAR, code 10)): has to be escaped using backslash to be included in name\n at [Source: org.elasticsearch.transport.netty4.ByteBufStreamInput@35977b9c; line: 254, column: 19]"}},"status":400}

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