Sitecore ContentSearchManager can't find index - sitecore

Question

I am using Sitecore 7.5 and I try to get bucket item's children.
I have an index "xyz" and it works when I try to get this index using:
var context = SearchManager.GetIndex("xyz").CreateSearchContext();
But I wanted to use this:
using (var context = ContentSearchManager.GetIndex("xyz").CreateSearchContext())
{
IQueryable<SearchResult> results = context.GetQueryable<SearchResult>();
}
and I receive an exception "Index xyz was not found". Why SearchManager finds this index but ContentSearchManager does not?
This is my index:
<configuration>
<indexes hint="list:AddIndex">
<index id="xyz" type="Sitecore.Search.Index, Sitecore.Kernel">
<param desc="name">$(id)</param>
<param desc="folder">xyz</param>
<Analyzer ref="search/analyzer" />
<locations hint="list:AddCrawler">
<web-pomoc type="Website.Classes.Search.BasicDatabaseCrawler, Website">
<Database>web</Database>
<Root>/sitecore/content/Shared/Kolekcje/Vod/Catchup-VOD</Root>
<templates hint="list:IncludeTemplate">
<entry>{DA757C92-A4CC-468F-BC22-AD347C8C4C9C}</entry>
</templates>
</web-pomoc>
</locat
</indexes>
</configuration>
Edit:
I changed my index and now it looks like this:
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
<sitecore>
<contentSearch>
<configuration type="Sitecore.ContentSearch.ContentSearchConfiguration, Sitecore.ContentSearch">
<indexes hint="list:AddIndex">
<index id="catchup_search" type="Sitecore.ContentSearch.LuceneProvider.LuceneIndex, Sitecore.ContentSearch.LuceneProvider">
<param desc="name">$(id)</param>
<param desc="folder">$(id)</param>
<!-- This initializes index property store. Id has to be set to the index id -->
<param desc="propertyStore" ref="contentSearch/indexConfigurations/databasePropertyStore" param1="$(id)" />
<configuration type=”Sitecore.ContentSearch.LuceneProvider.LuceneIndexConfiguration, Sitecore.ContentSearch.LuceneProvider”>
<indexAllFields>false</indexAllFields>
<initializeOnAdd>true</initializeOnAdd>
<analyzer ref=”contentSearch/indexConfigurations/defaultLuceneIndexConfiguration/analyzer” />
<include hint="list:IncludeTemplate">
<catchup_entry>{DA757C92-A4CC-468F-BC22-AD347C8C4C9C}</catchup_entry>
</include>
</configuration>
<strategies hint="list:AddStrategy">
<!-- NOTE: order of these is controls the execution order -->
<strategy ref="contentSearch/indexConfigurations/indexUpdateStrategies/onPublishEndAsync" />
</strategies>
<commitPolicyExecutor type="Sitecore.ContentSearch.CommitPolicyExecutor, Sitecore.ContentSearch">
<policies hint="list:AddCommitPolicy">
<policy type="Sitecore.ContentSearch.TimeIntervalCommitPolicy, Sitecore.ContentSearch" />
</policies>
</commitPolicyExecutor>
<locations hint="list:AddCrawler">
<crawler type="Sitecore.ContentSearch.SitecoreItemCrawler, Sitecore.ContentSearch">
<Database>web</Database>
<Root>/sitecore/content/xyz/avc</Root>
</crawler>
</locations>
</index>
</indexes>
</configuration>
</contentSearch>
</sitecore>
</configuration>
Now it appears in Index manager, but when I rebuild it, 0 items is processed.

Answer 1

Change the type from Sitecore.Search.Index, Sitecore.Kernel to Sitecore.ContentSearch.LuceneProvider.LuceneIndex, Sitecore.ContentSearch.LuceneProvider
SearchManager.GetIndex("xyz").CreateSearchContext() - makes use of the IndexSearchContext
while
ContentSearchManager.GetIndex("xyz").CreateSearchContext() - makes use of SitecoreContentSearch
Sitecore make use of the SitecoreContentSearch to rebuild the indexes.
Thanks

Answer 2

Your index definition is wrong
You need to use something like:
<configuration xmlns:patch="http://www.sitecore.net/xmlconfig/">
<sitecore>
<contentSearch>
<configuration type="Sitecore.ContentSearch.ContentSearchConfiguration, Sitecore.ContentSearch">
<indexes hint="list:AddIndex">
<index id="sitecore_web_index" type="Sitecore.ContentSearch.LuceneProvider.LuceneIndex, Sitecore.ContentSearch.LuceneProvider">
<param desc="name">$(id)</param>
<param desc="folder">$(id)</param>
...
</index>
</indexes>
</configuration>
</contentSearch>
Please check default index definition from Sitecore 7.5
After you add index configuration file please check if your index appear in IndexManager: