Search results for custom content not present - ISearchableContentType

ISearchableContentType has a method GetContentToIndex() is that method being hit and returning the SearchIndexDocument records for your unindexed Content?  If that is working is the SetIndexStatus method being called to set your IsIndexed flags?  If you go directly to Solr do you see your documents?  

ISearchableContentType has a method GetContentToIndex() is that method being hit and returning the SearchIndexDocument records for your unindexed Content?  If that is working is the SetIndexStatus method being called to set your IsIndexed flags?  If you go directly to Solr do you see your documents?  

It's not hitting GetContentToIndex(), I implemented ISearchableContentType interface in both my ContentType class and Application Type class exactly same as the below. Could you please to guide us to make it work?

Is ISearchableContentType listed as one of the interfaces in that class?  Is the ContentType enabled on your site?

Yes Mathew, It's custom application with core functionalities like (bookmark, comment, tag, like), everything works fine expect the search functionality.

Also when you resolve the issue with it not triggering, you don't appear to be adding the custom fields to the doc passed to solr ? 

e.g.
doc.AddField('ext_Product" , link.Product);

Here I implemented ISearchableContentType as an interface in my application. I also try to reindex my search. nothing seems to be working. How to add custom fields to the doc passed to solr?

#region ISearchableContentType

        public void SetIndexStatus(Guid[] contentIds, bool isIndexed)
        {
            LinksData.UpdateStatus(contentIds, isIndexed);
        }

        public IList<SearchIndexDocument> GetContentToIndex()
        {
            var docs = new List<SearchIndexDocument>();
           
            var links = MarketplaceInformation.GetAllCompany().Where(link => !link.IsIndexed);

            foreach (var link in links)
            {
                if (link == null) { continue; }

                var doc = Apis.Get<ISearchIndexing>().NewDocument(new Guid(link.ContentId), link.ContentTypeId, "linkitem", link.Url, link.HtmlName("web"), link.HtmlDescription("web"));
                doc.AddField("date", Apis.Get<ISearchIndexing>().FormatDate(link.CreatedDate));
                docs.Add(doc);
            }

            return docs;
        }

        public int[] GetViewSecurityRoles(Guid contentId)      
        {
            var content = MarketplaceInformation.GetCompany(contentId.ToString());
            if (content == null) { return new int[] { }; }
            if (content.Application == null) { return new int[] { }; }

            var Roles = Apis.Get<IRoles>().Find("Registered Users");
            //var iRoles = Roles.Select(r => r.Id.GetValueOrDefault()).ToArray();

            //return Apis.Get<IRoles>().Find("Registered Users").Select(r => r.Id.GetValueOrDefault()).ToArray();
            return new int[0];
        }

        string ISearchableContentType.GetViewHtml(IContent content, Target target)
        {
            if (content == null) { return null; }

            var user = Apis.Get<IUsers>().Get(new UsersGetOptions { Id = content.CreatedByUserId });

            var author = String.Format(@"<a href=""{0}"" class=""internal-link view-user-profile""><span></span>{1}</a>", PublicApi.Html.EncodeAttribute(user.ProfileUrl), PublicApi.Html.Encode(user.DisplayName));

            var appLink = content.Application != null
                ? String.Format(@"<a href=""{0}"">{1}</a>", PublicApi.Html.EncodeAttribute(content.Application.Url), content.Application.HtmlName(target.ToString()))
                : String.Empty;

            var groupLink = content.Application != null && content.Application.Container != null
                ? String.Format(@"<a href=""{0}"">{1}</a>", PublicApi.Html.EncodeAttribute(content.Application.Container.Url), content.Application.Container.HtmlName(target.ToString()))
                : String.Empty;

            return String.Format(@"
<div class=""abbreviated-post-header""></div>
<div class=""abbreviated-post ui-searchresult"">
    <div class=""post-metadata"">
        <ul class=""property-list"">
            <li class=""property-item date"">{0}</li>
                <li class=""property-item author"">
                    <span class=""user-name"">{1}</span>
                </li>
            <li>
                <ul class=""details"">
                    <li class=""property-item type""></li>
                </ul>
            </li>
        </ul>
    </div>
    <h4 class=""post-name"">
        <a class=""internal-link view-post"" title=""{3}"" href=""{4}"">
            {2}
        </a>
    </h4>
    <div class=""post-summary"">{5}</div>
    <div class=""post-application"">
        {6}
        {7}
    </div>
</div>
<div class=""abbreviated-post-footer""></div>",
            Apis.Get<ILanguage>().FormatDate(content.CreatedDate),
            author,
            content.HtmlName("web"),
            content.HtmlName("web"),
            PublicApi.Html.EncodeAttribute(content.Url),
            content.HtmlDescription("web"),
            appLink,
            groupLink);
        }
        #endregion

You can also check in Administration under Site > Search on the Include tab and make sure your custom content type is not disabled.

 Administration under Site > Search under include my custom content type is enabled.