Failed to parse in kibana panel

I get failure in panel, and cannot get any clue to fix. Can anyone help me?

This query is from one panel that works:
curl -XGET 'http://test.com:9200/logstash-2014.12.23/_search?pretty' -d '{
"facets": {
"0": {
"date_histogram": {
"field": "@timestamp",
"interval": "30s"
},
"global": true,
"facet_filter": {
"fquery": {
"query": {
"filtered": {
"query": {
"query_string": {
"query": "@type:ihsaccess1"
}
},
"filter": {
"bool": {
"must": [
{
"range": {
"@timestamp": {
"from": 1419321262506,
"to": 1419324862506
}
}
},
{
"fquery": {
"query": {
"query_string": {
"query": "@type:("ihsaccess1")"
}
},
"_cache": true
}
}
],
"must_not": [
{
"fquery": {
"query": {
"query_string": {
"query": "@fields.response:(200)"
}
},
"_cache": true
}
}
]
}
}
}
}
}
}
}
},
"size": 0
}'

And this one doesn't work:
curl -XGET 'http://test.com:9200/logstash-2014.12.23/_search?pretty' -d '{
"facets": {
"0": {
"date_histogram": {
"key_field": "@timestamp",
"value_field": "@fields.served-time",
"interval": "30s"
},
"global": true,
"facet_filter": {
"fquery": {
"query": {
"filtered": {
"query": {
"query_string": {
"query": "@type:ihsaccess1"
}
},
"filter": {
"bool": {
"must": [
{
"range": {
"@timestamp": {
"from": 1419321262510,
"to": 1419324862510
}
}
},
{
"fquery": {
"query": {
"query_string": {
"query": "@type:("ihsaccess1")"
}
},
"_cache": true
}
}
],
"must_not": [
{
"fquery": {
"query": {
"query_string": {
"query": "@fields.response:(200)"
}
},
"_cache": true
}
}
]
}
}
}
}
}
}
}
},
"size": 0
}'

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Here is the error message:

https://lh5.googleusercontent.com/-v-FKb3r81Gw/VJk2XlxNWPI/AAAAAAAAACw/yyLPeuX8Fek/s1600/111.png

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