[jira] [Created] (LUCENE-7394) Make MemoryIndex immutable

["Martijn van Groningen (JIRA)" <ji...@apache.org>]

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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