[Nutch Wiki] Update of "bin/nutch index" by SebastianNagel

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The "bin/nutch index" page has been changed by SebastianNagel:
https://wiki.apache.org/nutch/bin/nutch%20index?action=diff&rev1=1&rev2=2

Comment:
NUTCH-2390 No documentation on pluggable indexing

- '''TODO DESCRIBE THE PLUGGABLE INDEXING'''
+ '''Pluggable Indexing'''
  
+ The `index` command (running org.apache.nutch.indexer.IndexingJob) takes the content from one or multiple segments and passes it to all enabled [[IndexWriters|IndexWriter]] plugins which send the documents to Solr, Elasticsearch, and various other index back-ends.
+ 
+ == Nutch 1.x ==
+ 
+ {{{
+ Usage: bin/nutch index <crawldb> [-linkdb <linkdb>] [-params k1=v1&k2=v2...] (<segment> ... | -dir <segments>) [-noCommit] [-deleteGone] [-filter] [-normalize] [-addBinaryContent] [-base64]
+ }}}
+ 
+ Indexwriter plugins have to be enabled by the property `plugin.includes`. See [[IndexWriters|IndexWriter]] how to configure these plugins.
+