Terms facets top 10 stat,size:500 not valid

Hi,all:
I'm using elasticsearch for the top 10 with count 500 item,But not valid.

would be glad to let me know if you have any knowledge about this, thanks.

{
"facets": {
"terms": {
"terms": {
"field": "agent",
"size": 10,
"order": "count",
"exclude": []
},
"facet_filter": {
"fquery": {
"query": {
"filtered": {
"query": {
"bool": {
"should": [
{
"query_string": {
"query": "*"
}
}
]
}
},
"filter": {
"bool": {
"must": [
{
"range": {
"@timestamp": {
"from": null,
"to": null
}
}
}
]
}
}
}
}
}
}
}
},
"size": 500
}
Thanks,
Terry

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