I am using EpiFind, the version is 12.5.3 in NuGet.

I want to search by a few fields in the JSON below. I am trying this code, but I don't get the right results back. I don't understand why.

Snippet

var searchResult = _searchClient.Search<>RemoteHostedContentItem>()
    .For(filename).InField(x => x.SearchFilename).GetResult();

I want to search by

SearchSubsection

SearchFilename

But I don't know how to.

{
    "SearchSubsection$$string": "S-Reliability Coordination",
    "SearchTypeName$$string": "Document",
    "SearchFilename$$string": "RTVSA_Summary_071718_1509.html",
    "ContentTypeName": "Hypertext Markup Language",
    "SearchHitUrl$$string": "http://localhost:17104/api/extranetdocuments/getbyname/RTVSA_Summary_071718_1509.html",
    "_TypeShortName": "RemoteHostedContentItem",
    "accesstype": [
        "Visitors-RA"
    ],
    "rtvsareportanalysisfile": "Case Summary",
    "guid": "42b1048e-8995-4e89-804d-caafb55cdb3c",
    "SearchSection$$string": "Documents",
    "_type": "MisoWeb_Models_Find_RemoteHostedContentItem",
    "Files": {
        "original": "http://localhost:17104/api/extranetdocuments/getbyname/RTVSA_Summary_071718_1509.html"
    },
    "_id": "Extranet_RTVSA-448",
    "RolesWithReadAccess$$string": [
        "Visitors-RA"
    ],
    "_TypeDisplayName": "Remote Hosted Content Item",
    "FileName": "RTVSA_Summary_071718_1509.html",
    "CommitteeDocType": "test",
    "CreatedBy": "MISO.C2.RTVSA",
    "$type": "MisoWeb.Models.Find.RemoteHostedContentItem, MisoWeb",
    "UpdatedBy": "MISO.C2.RTVSA",
    "DocumentType": "S-Reliability Coordination",
    "SearchTitle$$string": "RTVSA_Summary_071718_1509.html",
    "rctype": "RTVSA",
    "ContentType": "text/html"
}