Attempt to fix union iterator, a=chris

diff --git a/src/library/index_bundle_iterators/UnionIterator.php b/src/library/index_bundle_iterators/UnionIterator.php
index 2e2dcb41b..2aac08cce 100644
--- a/src/library/index_bundle_iterators/UnionIterator.php
+++ b/src/library/index_bundle_iterators/UnionIterator.php
@@ -164,41 +164,6 @@ class UnionIterator extends IndexBundleIterator
         $this->count_block = count($pages);
         return $pages;
     }
-    /**
-     * Gets the summaries associated with the keys provided the keys
-     * can be found in the current block of docs returned by this iterator
-     * @param array $keys keys to try to find in the current block of returned
-     *     results
-     * @return array doc summaries that match provided keys
-     */
-    public function getCurrentDocsForKeys($keys = null)
-    {
-        if ($this->current_block_fresh == false) {
-            $result = $this->currentDocsWithWord();
-            if (!is_array($result)) {
-                return $result;
-            }
-        }
-        if (!is_array($this->pages)) {
-            return $this->pages;
-        }
-        if ($keys == null) {
-            $keys = array_keys($this->pages);
-        }
-        $out_pages = [];
-        foreach ($keys as $doc_key) {
-            if (!isset($this->pages[$doc_key]["ITERATOR"])) {
-                continue;
-            } else {
-                $tmp = $this->index_bundle_iterators[
-                    $this->pages[
-                        $doc_key]["ITERATOR"]]->getCurrentDocsForKeys(
-                            [$doc_key]);
-                $out_pages[$doc_key] = $tmp[$doc_key] ?? null;
-            }
-        }
-        return $out_pages;
-    }
     /**
      * Forwards the iterator one group of docs
      * @param array $gen_doc_offset a generation, doc_offset pair. If set,