Hiya - I'm seeing the following on elasticsearch 1.0 : the following query: 

                {
                    "query_string": {
                                          "fields" : [ "name", "content", 
"comment" ],
                        "query": "\\um",
                        "boost" : 500
                    }
                }


... seems to be failing with the following error:

nested: QueryParsingException[[reportoutputmanagementvistaplus] Failed to parse 
query [\um]]; nested: ParseException[Cannot parse '\um': Non-hex character in 
Unicode escape sequence: m]; nested: ParseException[Non-hex character in 
Unicode escape sequence: m]; }]


... so it seems that my escaped backslash is getting stripped out. 

The issue seems to resolve if I quadruple - escape the '\' (I don't see the 
exception, but I've no clue how elasticsearch is parsing the query). 

Is this expected / explainable ? Possibly a known issue in 1.0 ? 

Thanks for any / all insights - Dave




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