Move query admin weights to own config file.

(config/queryAdminWeights, query/search).js
	-Move the admin-level weights defined in `query/search` into a
	config file, addressing
	332597c653 (commitcomment-10892650).

config/queryAdminWeights.js

@@ -0,0 +1,15 @@
+/**
+ * Configurable weights that influence how, for a query with an admin value
+ * present, a match on any given admin value affects a document's overall
+ * score.
+ */
+
+module.exports = {
+  admin0: 20,
+  alpha3: 20,
+  admin1: 10,
+  admin1_abbr: 10,
+  admin2: 5,
+  locality: 1,
+  local_admin: 1
+};

query/search.js

@@ -2,7 +2,8 @@
 var logger = require('../src/logger'),
     queries = require('geopipes-elasticsearch-backend').queries,
     get_layers = require('../helper/layers'),
-    sort = require('../query/sort');
+    sort = require('../query/sort'),
+    adminFieldWeights = require( '../config/queryAdminWeights' );
 
 function generate( params ){
 
@@ -39,15 +40,6 @@ function generate( params ){
    * levels (admin0 carries more weight than locality, for instance).
    */
   if (params.input_admin) {
-    var adminFieldWeights = {
-      admin0: 20,
-      alpha3: 20,
-      admin1: 10,
-      admin1_abbr: 10,
-      admin2: 5,
-      locality: 1,
-      local_admin: 1
-    };
     query.query.filtered.query.bool.should = Object.keys( adminFieldWeights ).map( function ( field ){
       var boostFactor = adminFieldWeights[ field ];
       var shouldClause = { match: { } };