Martijn van Groningen created LUCENE-7394:
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             Summary: Make MemoryIndex immutable
                 Key: LUCENE-7394
                 URL: https://issues.apache.org/jira/browse/LUCENE-7394
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Martijn van Groningen


The MemoryIndex itself should just be a builder that constructs an IndexReader 
instance. The whole notion of freezing a memory index should be removed.

While we change this we should also clean this class up. There are many methods 
to add a field, we should just have a single method that accepts a 
`IndexableField`.

The `keywordTokenStream(...)` method is unused and untested and should be 
removed and it doesn't belong with the memory index.

The `setSimilarity(...)`, `createSearcher(...)` and `search(...)` methods 
should be removed, because the MemoryIndex should just be responsible for 
creating an IndexReader instance.



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