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Indexing key value pairs in files - Java

 
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I have checked Lucene's way of indexing files. But I would need to index key value pairs. Like I have many (word,sentence) combinations in a single file or few number of files. Most of the cases, it is in the single file.

I would like to search the sentence based on the word which I use for searching. What's the mechanism that I need to use with Java?

Something similar to Sequence file in Hadoop. Without parsing through entire data, we should be able to get the value for every key available.
 
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[Maneesh]Deleted response after finding about the crossposting.
 
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Please BeForthrightWhenCrossPostingToOtherSites (StackOverflow).
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