How do you add custom Solr indexes in XM/XP 10.2 with containers?

Question

I am trying to get a custom solr index to work in sitecore 10.2 running in containers.

Config

        <?xml version="1.0" encoding="utf-8" ?>
    <configuration xmlns:patch="http://www.sitecore.net/xmlconfig/" 
    xmlns:role="http://www.sitecore.net/xmlconfig/role/" 
     xmlns:search="http://www.sitecore.net/xmlconfig/search/">
        <sitecore role:require="Standalone or ContentDelivery or 
         ContentManagement" search:require="solr">
        <contentSearch>
            <configuration 
 type="Sitecore.ContentSearch.ContentSearchConfiguration, 
 Sitecore.ContentSearch">
                <indexes hint="list:AddIndex">
                    <index id="sitecore_passportal_web_index" 
type="Sitecore.ContentSearch.SolrProvider.SolrSearchIndex, 
Sitecore.ContentSearch.SolrProvider">
                        <param desc="name">$(id)</param>
                        <param desc="core">$(id)</param>
                        <param desc="propertyStore" 
ref="contentSearch/indexConfigurations/databasePropertyStore" 
param1="$(id)" />
                    <configuration ref="contentSearch/indexConfigurations/passPortalSolrIndexConfiguration" />
                    <strategies hint="list:AddStrategy">
                        <strategy ref="contentSearch/indexConfigurations/indexUpdateStrategies/manual" role:require="(ContentManagement and !Indexing) or (ContentDelivery and !Indexing)"/>
                        <strategy ref="contentSearch/indexConfigurations/indexUpdateStrategies/onPublishEndAsyncSingleInstance" role:require="Standalone or (ContentManagement and Indexing) or (ContentDelivery and Indexing)" />
                    </strategies>
                    <locations hint="list:AddCrawler">
                        <crawler type="Sitecore.ContentSearch.SitecoreItemCrawler, Sitecore.ContentSearch">
                            <Database>web</Database>
                            <Root>/sitecore</Root>
                        </crawler>
                    </locations>
                     
<enableItemLanguageFallback>false</enableItemLanguageFallback>
                     
<enableFieldLanguageFallback>false</enableFieldLanguageFallback>
                    </index>
                </indexes>
            </configuration>
        </contentSearch>
    </sitecore>
</configuration>

I am able to index and see items in solr.

running this code I do not get any results

            using (var searchContext = _passPortalSearchContextProvider.CreateContext())
            {

                IQueryable<BenefitSearchResultItem> results =
                    searchContext.GetQueryable<BenefitSearchResultItem>()
                        //.Where(x => x.Path.StartsWith(siteRootPath))
                        .Where(x => x.TemplateId == Benefit.TEMPLATE_ID)
                        //.Where(x => x.RenewalCodes.Contains(renewalCode))
                        ;

                return results;
            }

So I tried changing the config to using a switch on rebuild solr index

                <index id="sitecore_passportal_web_index" type="Sitecore.ContentSearch.SolrProvider.SwitchOnRebuildSolrSearchIndex, Sitecore.ContentSearch.SolrProvider">
                    <param desc="name">$(id)</param>
                    <param desc="core">$(id)</param>
                    <param desc="rebuildcore">$(id)_rebuild</param>

I get the following error when trying to rebuild the index in the sitecore control panel

ManagedPoolThread #4 05:57:11 INFO  Job started: Index_Update_IndexName=sitecore_passportal_web_index
ManagedPoolThread #4 05:57:11 ERROR Exception
Exception: System.Reflection.TargetInvocationException
Message: Exception has been thrown by the target of an invocation.
Source: mscorlib
   at System.RuntimeMethodHandle.InvokeMethod(Object target, Object[] arguments, Signature sig, Boolean constructor)
   at System.Reflection.RuntimeMethodInfo.UnsafeInvokeInternal(Object obj, Object[] parameters, Object[] arguments)
   at System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture)
   at Sitecore.Reflection.ReflectionUtil.InvokeMethod(MethodInfo method, Object[] parameters, Object obj)
   at Sitecore.Jobs.JobRunner.RunMethod(JobArgs args)
   at (Object , Object )
   at Sitecore.Pipelines.CorePipeline.Run(PipelineArgs args)
   at Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain, Boolean failIfNotExists)
   at Sitecore.Pipelines.DefaultCorePipelineManager.Run(String pipelineName, PipelineArgs args, String pipelineDomain)
   at Sitecore.Jobs.DefaultJob.DoExecute()
   at Sitecore.Abstractions.BaseJob.ThreadEntry(Object state)

Nested Exception

Exception: SolrNet.Exceptions.SolrConnectionException
Message: <html>
<head>
<meta http-equiv="Content-Type" content="text/html;charset=utf-8"/>
<title>Error 404 Not Found</title>
</head>
<body><h2>HTTP ERROR 404 Not Found</h2>
<table>
<tr><th>URI:</th><td>/solr/sitecore_passportal_web_index_rebuild/update</td></tr>
<tr><th>STATUS:</th><td>404</td></tr>
<tr><th>MESSAGE:</th><td>Not Found</td></tr>
<tr><th>SERVLET:</th><td>default</td></tr>
</table>