SharePoint 2013 Search Index/Partition Degraded

Today our partner facing issue in SharePoint 2013 search. The problem is while searching, its showing below message with correlation id

Search has encountered a problem that prevents results from being returned. If the issue persists Please contact your administrator
Correlation ID: c8ce779c-8cd6-e095-163a-5faa3c35abe1

I found in log

Component and System=Query1-623dbcf1-828e-4f73-87cd-7abdd3bc5fd8, Correlation ID=c8ce779c-8cd6-e095-163a-5faa3c35abe1, Tenant ID=00000000-0000-0000-0000-000000000000 Error code=0, Flow Name=Microsoft.SharePointSearchProviderFlow, Operator Name=ParserExecutor, Message=The processing of item fails with error Cannot plan query for index system SP0da3677428f7. Index fragment '0' has no available cells. Cell statuses: [Cell I.0.0 on node IndexComponent1: Cell status is set to 'not available' (cell out of sync or seeding)]

And in the Search administration page "Search Application Topology section, the Index Partition is "x" symbol.

Solution:

We have to run Index Reset and run full crawl. 

 http://www.thesysadminhimself.com/2013/08/sharepoint-search-index-partition-degraded.html

SharePoint 2013 Six Pillar New Features

Cross-product solutions with Exchange, Lync, and SharePoint Server

http://technet.microsoft.com/en-us/library/dn262744.aspx 

Explore SharePoint 2013

http://technet.microsoft.com/en-us/library/cc261970(v=office.15) 

SharePoint 2013: New Features and Comparison with SharePoint 2010

1. Instead of six pillars in SharePoint 2010, SharePoint 2013 have 4 features 
1. Share
2. Organize
3. Discover
4. Build 
5. Manage
2. Search - Combination of SharePoint OOB Search and FAST Search called SharePoint Search
3. Hover and preview documents in search results, document libraries, lists etc. We can editing and sharing in the preview itself
4. Whenever we create site/list/library we can define policy, terms, templates and retention policy
5. HTML 5 compatible
6. Mobile device channel option for IOS, Android 
7. Short URL do not need additional steps to create hyperlink in navigation
8. Synchronization with SkyDrive
9. Navigation - We can edit and modify on the same location without going to Site Action -> Site Settings
10. Edit with Dream Viewer (Master Page and CSS) and import the HTML code and apply in SharePoint
11. Site Action moved to right top side from left
12. SharePoint 2013 is all about Application, instead of creating list in 2010, we can create list App in 2013
13. App catalog to buy and install apps in SharePoint
14. SharePoint 2013 has 15 Hive Folder
15. No In-Place migration, only database migration
16. Social networking works as the concepts of Facebook, twitter
17. In SharePoint Designer 2013 in only code section, design has removed
18. Video Search as in You Tube

Test lab guides for SharePoint Server 2013

http://technet.microsoft.com/en-us/library/hh872914.aspx

Why we need to go SharePoint 2013

1. Why we need to go SharePoint 2013
2. What is the advantage of SharePoint 2013

http://www.cio.com/article/728615/7_Things_About_SharePoint_2013_All_IT_Pros_Should_Know?page=1&taxonomyId=3160