Add LegacySearch functionality

Introduced `LegacySearchController` and `LegacySearchService` to handle legacy search requests.

src/main/java/edu/harvard/dbmi/avillach/dictionary/legacysearch/LegacySearchController.java

@@ -0,0 +1,29 @@
+package edu.harvard.dbmi.avillach.dictionary.legacysearch;
+
+import edu.harvard.dbmi.avillach.dictionary.legacysearch.model.LegacySearchQuery;
+import edu.harvard.dbmi.avillach.dictionary.legacysearch.model.Results;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.http.ResponseEntity;
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+import java.io.IOException;
+
+@Controller
+public class LegacySearchController {
+
+    private final LegacySearchService legacySearchService;
+
+    @Autowired
+    public LegacySearchController(LegacySearchService legacySearchService) {
+        this.legacySearchService = legacySearchService;
+    }
+
+    @RequestMapping(path = "/search")
+    public ResponseEntity<Results> legacySearch(@RequestBody String jsonString) throws IOException {
+        LegacySearchQuery legacySearchQuery = LegacySearchQueryMapper.mapFromJson(jsonString);
+        return ResponseEntity.ok(legacySearchService.getSearchResults(legacySearchQuery.filter(), legacySearchQuery.pageable()));
+    }
+
+}

src/main/java/edu/harvard/dbmi/avillach/dictionary/legacysearch/LegacySearchService.java

@@ -0,0 +1,24 @@
+package edu.harvard.dbmi.avillach.dictionary.legacysearch;
+
+import edu.harvard.dbmi.avillach.dictionary.concept.ConceptService;
+import edu.harvard.dbmi.avillach.dictionary.filter.Filter;
+import edu.harvard.dbmi.avillach.dictionary.legacysearch.model.Results;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.domain.Pageable;
+import org.springframework.stereotype.Service;
+
+@Service
+public class LegacySearchService {
+
+    private final ConceptService conceptService;
+
+    @Autowired
+    public LegacySearchService(ConceptService conceptService) {
+        this.conceptService = conceptService;
+    }
+
+    public Results getSearchResults(Filter filter, Pageable pageable) {
+        return new Results(conceptService.getLegacySearchResults(filter, pageable));
+    }
+
+}