db.VERISK_METADATA_COLLECTION.aggregate([
{ "$match":{contentType:"FRM"}},
{ "$project":{ "appCount": {$size:"$applicability"}}},
{ "$group": { "_id":null, Total: {$sum:"$appCount" } }},
{ "$project": {Total:1,"_id":0}}
])

{
"_id" : "04c64247-7030-4b0e-a2f9-da77d27b8667",
"_class" : "com.mongodb.BasicDBObject",
"documentType" : "doc",
"stateType" : "AZ",
"availabilityDate" : "",
"multiState" : "false",
"language" : "E",
"title" : "ARIZONA LIMITED EXCLUSION OF ACTS OF TERRORISM (OTHER THAN CERTIFIED ACTS OF TERRORISM); CAP ON LOSSES FROM CERTIFIED ACTS OF TERRORISM; COVERAGE FOR CERTAIN FIRE LOSSES",
"displayFormNumber" : "FP 10 53 09 05",
"mandatory" : "N",
"client_id" : "VERISK_001",
"ignored_record_type" : "new_publish_insert",
"formLobType" : "FR",
"formNumber" : "FP10530905",
"job_queue_id" : "f8ac839f-24ee-4063-bc3c-7ed00eb91f11",
"contentType" : "FRM",
"directoryName" : "FRFORMS",
"formsType" : "E",
"objectTypeCode" : "13",
"documentName" : "FP10539O",
"doc_id" : [
    "f3f528e2-32ca-49f8-b287-b436befae779"
],
"update_date" : "2017-12-27 21:05:21.189 EST",
"earliestEffectiveDate_dt" : "2005-09-01T00:00:00Z",
"formStatus" : "H",
"applicability" : [
    {
        "filingId_dbValue_str" : "CL-2005-OFOTR",
        "jurisdiction" : "AZ",
        "withDrawnDate" : "2008-10-01T00:00:00Z",
        "filingId" : "CL-2005-OFOTR",
        "derivedFrom" : "",
        "id" : "0ef65042-6b35-460e-b12a-46766c64ff27",
        "circularNumber" : "LI-FR-2005-121",
        "lob" : "FR",
        "effectiveDate" : "2005-09-01T00:00:00Z",
        "circularDate" : "2005-07-15T00:00:00Z"
    }
],
"created_date" : "2017-12-27 21:05:21.106 EST",
"uri" : "VERISK_001/FRM/FP10530905"