Here we take a look at options for searching the federation and individual Fedwiki sites.
Here are some alternatives: Alternatives (A-Z order):
# Node Based Alternatives
- [ ] Norch 
- [ ] search-index
# General Alternatives
- [ ] Blekko
- [x] ElasticSearch
- [ ] IndexDen
- [ ] SearchBlox
- [ ] Searchify
- [ ] Spinn3r
- [ ] Websolr
# Google Site Search
Long story short, I started to play with Google Custom Search to create a tool which helps me to search the federation.
With Linked Custom Search Engine and Topical Engines we can create all sorts of interesting dynamically created search engines for wiki.
# Sitemaps
Sitemaps are an easy way for webmasters to inform search engines about pages on their sites that are available for crawling - sitemaps.org
# Elasticsearch
Elasticsearch is a search server based on Lucene. It provides a distributed, multitenant-capable full-text search engine with a RESTful web interface and schema-free JSON documents - wikipedia
Elasticsearch is developed in Java and is released as open source under the terms of the Apache License. Elasticsearch is the second most popular enterprise search engine after Apache Solr, also based on Lucene - elastic.co
"ElasticSearch 101
– a getting started tutorial" is a nice tutorial which includes getting it up and running on OSX or Windows for testing the REST services - joelabrahamsson.com/
# See also - Search Engines - Sorting and Searching - Search Plugin - Demystifying SEO - Multiway Trees - Search Index - Distributed Search - Distributed Hash Table