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Ami,

There are two parts to implementing search using DNN (and lucene).  #1 - Indexing data (adding or updating data in the lucene index) and  #2 - Querying the data (searching the index).

My tutorial that explains the ModuleSearchBase implementation is for the purpose of  #1.  The GetModifiedSearchDocuments() implementation (in DotNetNuclear.SearchContent.zip) is called when DNN's Site Crawler scheduled task runs to ask all DNN modules for their search index data.  My tutorial shows how you can push custom module data into the DNN lucene index.  This has nothing to do with querying the lucene index.

My other tutorial for customizing the search results (DotNetNuclear_HandlebarsCustomResults.zip) shows #2, querying the index.  It is true I don't show the C# code for performing a lucene search.  Instead I call the core webAPI method from DNN that queries the index.  This is a javascript method in the results.ascx:

function runSearch(term, filter) {
var apiUrl = dnnSearchAPI.getServiceRoot('internalservices') + "searchService/search";
if (filter) { term += ':' + filter; }
apiUrl += '?search=' + encodeURIComponent(term) + '&pageIndex=1&pageSize=15&sortOption=0&culture=en-US'
$.get(apiUrl, function( data ) {
//use the search result data
});
}

Above you can see I am using the DNN's internalServices/searchService/search webapi method.   You can look at how DNN performs the lucene search in this webAPI method.  https://github.com/dnnsoftware/Dnn.Pl...

If you are just trying to implement a custom search input box that should be on every page, I would build it as a Theme/Skin Object.  I have a tutorial that explains how to build a custom skin object. This would allow your search box to be embedded into the site's skin so you don't need to put a module on all pages.

To answer your question about the core search input.  That is a skin object.  The code is in /admin/Skins/search.ascx.  You can start by copying this for your custom skin object.

Hopefully this helps with confusion.  I will try to check on this post more often so I can answer your questions sooner.