Details
Description
Currently there are two singletons available - MergePolicy.NO_COMPOUND_FILES and MergePolicy.COMPOUND_FILES and it's confusing to distinguish on compound files when the merge policy never merges segments.
We should have one singleton - NoMergePolicy.INSTANCE
Post to the relevant discussion - http://mail-archives.apache.org/mod_mbox/lucene-java-user/201404.mbox/%3CCAOdYfZXXyVSf9%2BxYaRhr5v2O4Mc6S2v-qWuT112_CJFYhWTPqw%40mail.gmail.com%3E