Remove size-estimator-lucene-solr.xls (#2389)

diff --git a/dev-tools/README.txt b/dev-tools/README.txt
index 9d64fcf..db5a8e1 100644
--- a/dev-tools/README.txt
+++ b/dev-tools/README.txt
@@ -5,7 +5,6 @@
 
 Description of dev-tools/ contents:
 
-./size-estimator-lucene-solr.xls -- Spreadsheet for estimating memory and disk usage in Lucene/Solr
 ./missing-doclet -- JavaDoc validation doclet subproject
 ./doap/       -- Lucene and Solr project descriptors in DOAP RDF format.
 ./scripts/    -- Odds and ends for building releases, etc.
diff --git a/dev-tools/size-estimator-lucene-solr.xls b/dev-tools/size-estimator-lucene-solr.xls
deleted file mode 100644
index 930d74d..0000000
--- a/dev-tools/size-estimator-lucene-solr.xls
+++ /dev/null
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