Add support for tenants exists endpoint

src/main/java/io/weaviate/client/v1/misc/model/MultiTenancyConfig.java

@@ -14,4 +14,5 @@
 @FieldDefaults(makeFinal = true, level = AccessLevel.PRIVATE)
 public class MultiTenancyConfig {
   Boolean enabled;
+  Boolean autoTenantCreation;
 }

src/main/java/io/weaviate/client/v1/schema/Schema.java

@@ -1,7 +1,7 @@
 package io.weaviate.client.v1.schema;
 
-import io.weaviate.client.base.http.HttpClient;
 import io.weaviate.client.Config;
+import io.weaviate.client.base.http.HttpClient;
 import io.weaviate.client.v1.schema.api.ClassCreator;
 import io.weaviate.client.v1.schema.api.ClassDeleter;
 import io.weaviate.client.v1.schema.api.ClassExists;
@@ -15,6 +15,7 @@
 import io.weaviate.client.v1.schema.api.ShardsUpdater;
 import io.weaviate.client.v1.schema.api.TenantsCreator;
 import io.weaviate.client.v1.schema.api.TenantsDeleter;
+import io.weaviate.client.v1.schema.api.TenantsExists;
 import io.weaviate.client.v1.schema.api.TenantsGetter;
 import io.weaviate.client.v1.schema.api.TenantsUpdater;
 
@@ -86,4 +87,8 @@ public TenantsDeleter tenantsDeleter() {
   public TenantsGetter tenantsGetter() {
     return new TenantsGetter(httpClient, config);
   }
+
+  public TenantsExists tenantsExists() {
+    return new TenantsExists(httpClient, config);
+  }
 }

src/main/java/io/weaviate/client/v1/schema/api/TenantsExists.java

@@ -0,0 +1,37 @@
+package io.weaviate.client.v1.schema.api;
+
+import io.weaviate.client.Config;
+import io.weaviate.client.base.BaseClient;
+import io.weaviate.client.base.ClientResult;
+import io.weaviate.client.base.Response;
+import io.weaviate.client.base.Result;
+import io.weaviate.client.base.http.HttpClient;
+import io.weaviate.client.base.util.UrlEncoder;
+import org.apache.http.HttpStatus;
+
+public class TenantsExists extends BaseClient<Object> implements ClientResult<Boolean> {
+
+  private String className;
+  private String tenant;
+
+  public TenantsExists(HttpClient httpClient, Config config) {
+    super(httpClient, config);
+  }
+
+  public TenantsExists withClassName(String className) {
+    this.className = className;
+    return this;
+  }
+
+  public TenantsExists withTenant(String tenant) {
+    this.tenant = tenant;
+    return this;
+  }
+
+  @Override
+  public Result<Boolean> run() {
+    String path = String.format("/schema/%s/tenants/%s", UrlEncoder.encodePathParam(className), UrlEncoder.encodePathParam(tenant));
+    Response<Object> resp = sendHeadRequest(path, Object.class);
+    return new Result<>(resp.getStatusCode(), resp.getStatusCode() == HttpStatus.SC_OK, resp.getErrors());
+  }
+}

src/test/java/io/weaviate/integration/client/schema/ClientSchemaMultiTenancyTest.java

@@ -149,6 +149,17 @@ public void shouldAddTenantsToMTClass() {
     assertThat(addResult).isNotNull()
       .returns(false, Result::hasErrors)
       .returns(true, Result::getResult);
+
+    for (String tenant: tenants) {
+      Result<Boolean> exists = client.schema().tenantsExists()
+        .withClassName("Pizza")
+        .withTenant(tenant)
+        .run();
+
+      assertThat(exists).isNotNull()
+        .returns(false, Result::hasErrors)
+        .returns(true, Result::getResult);
+    }
   }
 
   @Test