Add custom synonym_analyzer

Signed-off-by: Prudhvi Godithi <[email protected]>

Author: prudhvigodithi

modules/analysis-common/src/main/java/org/opensearch/analysis/common/CommonAnalysisModulePlugin.java

@@ -146,6 +146,7 @@
 import org.opensearch.index.analysis.PreConfiguredTokenizer;
 import org.opensearch.index.analysis.TokenFilterFactory;
 import org.opensearch.index.analysis.TokenizerFactory;
+import org.opensearch.indices.analysis.AnalysisModule;
 import org.opensearch.indices.analysis.AnalysisModule.AnalysisProvider;
 import org.opensearch.indices.analysis.PreBuiltCacheFactory.CachingStrategy;
 import org.opensearch.plugins.AnalysisPlugin;
@@ -157,6 +158,7 @@
 import org.opensearch.threadpool.ThreadPool;
 import org.opensearch.watcher.ResourceWatcherService;
 
+import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
@@ -176,6 +178,9 @@ public class CommonAnalysisModulePlugin extends Plugin implements AnalysisPlugin
 
     private final SetOnce<ScriptService> scriptService = new SetOnce<>();
 
+    private AnalysisModule analysisModule;
+
+
     @Override
     public Collection<Object> createComponents(
         Client client,
@@ -191,9 +196,16 @@ public Collection<Object> createComponents(
         Supplier<RepositoriesService> repositoriesServiceSupplier
     ) {
         this.scriptService.set(scriptService);
+        try {
+            this.analysisModule = new AnalysisModule(environment,
+                List.of(this));
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
         return Collections.emptyList();
     }
 
+
     @Override
     public List<ScriptContext<?>> getContexts() {
         return Collections.singletonList(AnalysisPredicateScript.CONTEXT);
@@ -332,8 +344,13 @@ public Map<String, AnalysisProvider<TokenFilterFactory>> getTokenFilters() {
         filters.put("sorani_normalization", SoraniNormalizationFilterFactory::new);
         filters.put("stemmer_override", requiresAnalysisSettings(StemmerOverrideTokenFilterFactory::new));
         filters.put("stemmer", StemmerTokenFilterFactory::new);
-        filters.put("synonym", requiresAnalysisSettings(SynonymTokenFilterFactory::new));
-        filters.put("synonym_graph", requiresAnalysisSettings(SynonymGraphTokenFilterFactory::new));
+        filters.put("synonym", (indexSettings, environment, name, settings) ->
+            new SynonymTokenFilterFactory(indexSettings, environment, name, settings, analysisModule.getAnalysisRegistry())
+        );
+        filters.put("synonym_graph", (indexSettings, environment, name, settings) ->
+            new SynonymGraphTokenFilterFactory(indexSettings, environment, name, settings, analysisModule.getAnalysisRegistry())
+        );
+
         filters.put("trim", TrimTokenFilterFactory::new);
         filters.put("truncate", requiresAnalysisSettings(TruncateTokenFilterFactory::new));
         filters.put("unique", UniqueTokenFilterFactory::new);

modules/analysis-common/src/main/java/org/opensearch/analysis/common/SynonymGraphTokenFilterFactory.java

@@ -40,6 +40,7 @@
 import org.opensearch.env.Environment;
 import org.opensearch.index.IndexSettings;
 import org.opensearch.index.analysis.AnalysisMode;
+import org.opensearch.index.analysis.AnalysisRegistry;
 import org.opensearch.index.analysis.CharFilterFactory;
 import org.opensearch.index.analysis.TokenFilterFactory;
 import org.opensearch.index.analysis.TokenizerFactory;
@@ -49,8 +50,8 @@
 
 public class SynonymGraphTokenFilterFactory extends SynonymTokenFilterFactory {
 
-    SynonymGraphTokenFilterFactory(IndexSettings indexSettings, Environment env, String name, Settings settings) {
-        super(indexSettings, env, name, settings);
+    SynonymGraphTokenFilterFactory(IndexSettings indexSettings, Environment env, String name, Settings settings, AnalysisRegistry analysisRegistry) {
+        super(indexSettings, env, name, settings, analysisRegistry);
     }
 
     @Override

modules/analysis-common/src/main/java/org/opensearch/analysis/common/SynonymTokenFilterFactory.java

@@ -48,7 +48,9 @@
 import org.opensearch.index.analysis.CustomAnalyzer;
 import org.opensearch.index.analysis.TokenFilterFactory;
 import org.opensearch.index.analysis.TokenizerFactory;
+import org.opensearch.index.analysis.AnalysisRegistry;
 
+import java.io.IOException;
 import java.io.Reader;
 import java.io.StringReader;
 import java.util.List;
@@ -64,8 +66,10 @@ public class SynonymTokenFilterFactory extends AbstractTokenFilterFactory {
     protected final Settings settings;
     protected final Environment environment;
     protected final AnalysisMode analysisMode;
+    private final String synonymAnalyzer;
+    private final AnalysisRegistry analysisRegistry;
 
-    SynonymTokenFilterFactory(IndexSettings indexSettings, Environment env, String name, Settings settings) {
+    SynonymTokenFilterFactory(IndexSettings indexSettings, Environment env, String name, Settings settings, AnalysisRegistry analysisRegistry) {
         super(indexSettings, name, settings);
         this.settings = settings;
 
@@ -83,6 +87,8 @@ public class SynonymTokenFilterFactory extends AbstractTokenFilterFactory {
         boolean updateable = settings.getAsBoolean("updateable", false);
         this.analysisMode = updateable ? AnalysisMode.SEARCH_TIME : AnalysisMode.ALL;
         this.environment = env;
+        this.synonymAnalyzer = settings.get("synonym_analyzer", null);
+        this.analysisRegistry = analysisRegistry;
     }
 
     @Override
@@ -137,6 +143,17 @@ Analyzer buildSynonymAnalyzer(
         List<TokenFilterFactory> tokenFilters,
         Function<String, TokenFilterFactory> allFilters
     ) {
+        if (synonymAnalyzer != null) {
+            Analyzer customSynonymAnalyzer;
+            try {
+                customSynonymAnalyzer = analysisRegistry.getAnalyzer(synonymAnalyzer);
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
+            if (customSynonymAnalyzer != null) {
+                return customSynonymAnalyzer;
+            }
+        }
         return new CustomAnalyzer(
             tokenizer,
             charFilters.toArray(new CharFilterFactory[0]),