The best replacement for endeca is solr.

The best alternatives to endeca are rated as following:
★★★★★  solr
★★★★  lucene
★★★  obiee
★★★  elasticsearch
★★  autonomy
★★  google search appliance
★  atg search
★  spotfire
★  attivio
★  inquira
  vivisimo

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Speaking about endeca, one probably shouldn't forget about atg.

Other search terms related to endeca and their ratings are:
★★★★★ atg
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Google Trends

Scale is based on the average worldwide traffic of endeca in all years. Click on graph for more.
endeca
solr
lucene