move elision filter after lowercase filter

this affects all languages using the elision filter
languages fr and it are updated now
languages ca and ga are still missing other components and
do not yet have an analyzer, but they should follow this lead
once they are ready

fixes #218

analysis/language/fr/analyzer_fr.go

@@ -43,8 +43,8 @@ func AnalyzerConstructor(config map[string]interface{}, cache *registry.Cache) (
 	rv := analysis.Analyzer{
 		Tokenizer: tokenizer,
 		TokenFilters: []analysis.TokenFilter{
-			elisionFilter,
 			toLowerFilter,
+			elisionFilter,
 			stopFrFilter,
 			stemmerFrFilter,
 		},

analysis/language/it/analyzer_it.go

@@ -43,8 +43,8 @@ func AnalyzerConstructor(config map[string]interface{}, cache *registry.Cache) (
 	rv := analysis.Analyzer{
 		Tokenizer: tokenizer,
 		TokenFilters: []analysis.TokenFilter{
-			elisionFilter,
 			toLowerFilter,
+			elisionFilter,
 			stopItFilter,
 			stemmerItFilter,
 		},

analysis/language/it/analyzer_it_test.go

@@ -61,6 +61,15 @@ func TestItalianAnalyzer(t *testing.T) {
 				},
 			},
 		},
+		// test for bug #218
+		{
+			input: []byte("Nell'anfora"),
+			output: analysis.TokenStream{
+				&analysis.Token{
+					Term: []byte("anfor"),
+				},
+			},
+		},
 	}
 
 	cache := registry.NewCache()