I've tried implementing a basic search into my site, however I'm getting an EOF error when running it. I'm passing in "eng" as my term with no spaces or special characters.

code:

if (!_examineManager.TryGetIndex(UmbracoIndexes.ExternalIndexName, out IIndex index))
            throw new InvalidOperationException($"No index found by name {UmbracoIndexes.ExternalIndexName}");

        var searcher = index.Searcher;
        var results = searcher.CreateQuery(IndexTypes.Content)
            .Field("nodeName", searchTerm.MultipleCharacterWildcard())
            .Execute();

error:

 Lucene.Net.QueryParsers.Classic.ParseException
  HResult=0x80131500
  Message=Cannot parse '__IndexType:content': Encountered "<EOF>" at line 1, column 0.
Was expecting one of:
    <NOT> ...
    "+" ...
    "-" ...
    <BAREOPER> ...
    "(" ...
    "*" ...
    <QUOTED> ...
    <TERM> ...
    <PREFIXTERM> ...
    <WILDTERM> ...
    <REGEXPTERM> ...
    "[" ...
    "{" ...
    <NUMBER> ...
    <TERM> ...
    "*" ...

  Source=Lucene.Net.QueryParser
  StackTrace:
   at Lucene.Net.QueryParsers.Classic.QueryParserBase.Parse(String query)
   at Examine.Lucene.Search.LuceneSearchQueryBase.ParseRawQuery(String rawQuery)
   at Examine.Lucene.Search.LuceneSearchQueryBase.GetFieldInternalQuery(String fieldName, IExamineValue fieldValue, Boolean useQueryParser)
   at Examine.Lucene.Search.LuceneSearchQuery.Search(QueryOptions options)
   at Examine.Lucene.Search.LuceneSearchQuery.Execute(QueryOptions options)
   at Examine.Lucene.Search.LuceneBooleanOperation.Execute(QueryOptions options)
   at FatMedia.BlackburnCollege.Services.Search.SearchService.FatMedia.BlackburnCollege.Services.Search.ISearchService.SiteSearch(String searchTerm) in C:\Projects\BlackburnCollege\src\FatMedia.BlackburnCollege.Services\Search\SearchService.cs:line 29
   at FatMedia.BlackburnCollege.Web.Controllers.CourseApi.CourseApiController.Search(SearchRequestModel requestModel) in C:\Projects\BlackburnCollege\src\FatMedia.BlackburnCollege.Web\Controllers\CourseApi\CourseApiController.cs:line 25
   at Microsoft.AspNetCore.Mvc.Infrastructure.ActionMethodExecutor.SyncActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeActionMethodAsync()
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeNextActionFilterAsync()

  This exception was originally thrown at this call stack:
    [External Code]

Inner Exception 1:
ParseException: Encountered "<EOF>" at line 1, column 0.
Was expecting one of:
    <NOT> ...
    "+" ...
    "-" ...
    <BAREOPER> ...
    "(" ...
    "*" ...
    <QUOTED> ...
    <TERM> ...
    <PREFIXTERM> ...
    <WILDTERM> ...
    <REGEXPTERM> ...
    "[" ...
    "{" ...
    <NUMBER> ...
    <TERM> ...
    "*" ...