has to be escaped using backslash to be included in string value

[root@d myssh]# cat ESdel_bulk_file1544528090.log
{"error":{"root_cause":[{"type":"json_parse_exception","reason":"Illegal unquoted character ((CTRL-CHAR, code 5)): has to be escaped using backslash to be included in string value at [Source: [B@23ecfd2d; line: 1, column: 52]"}],"type":"json_parse_exception","reason":"Illegal unquoted character ((CTRL-CHAR, code 5)): has to be escaped using backslash to be included in string value at [Source: [B@23ecfd2d; line: 1, column: 52]"},"status":500}[root@d myssh]#