diff --git a/x-pack/platform/plugins/shared/observability_ai_assistant/server/routes/knowledge_base/route.ts b/x-pack/platform/plugins/shared/observability_ai_assistant/server/routes/knowledge_base/route.ts
index a04b088c55775..6647e88d48d1f 100644
--- a/x-pack/platform/plugins/shared/observability_ai_assistant/server/routes/knowledge_base/route.ts
+++ b/x-pack/platform/plugins/shared/observability_ai_assistant/server/routes/knowledge_base/route.ts
@@ -103,11 +103,11 @@ const reIndexKnowledgeBase = createObservabilityAIAssistantServerRoute({
       requiredPrivileges: ['ai_assistant'],
     },
   },
-  handler: async (resources): Promise<{ result: boolean }> => {
+  handler: async (resources): Promise<{ success: boolean }> => {
     const client = await resources.service.getClient({ request: resources.request });
     const { inference_id: inferenceId } = resources.params.query;
-    const result = await client.reIndexKnowledgeBaseWithLock(inferenceId);
-    return { result };
+    await client.reIndexKnowledgeBaseWithLock(inferenceId);
+    return { success: true };
   },
 });
 
diff --git a/x-pack/platform/plugins/shared/observability_ai_assistant/server/service/knowledge_base_service/index.ts b/x-pack/platform/plugins/shared/observability_ai_assistant/server/service/knowledge_base_service/index.ts
index 9b08e32ddf86c..694e86871a8e9 100644
--- a/x-pack/platform/plugins/shared/observability_ai_assistant/server/service/knowledge_base_service/index.ts
+++ b/x-pack/platform/plugins/shared/observability_ai_assistant/server/service/knowledge_base_service/index.ts
@@ -33,7 +33,6 @@ import { hasKbWriteIndex } from './has_kb_index';
 import { getInferenceIdFromWriteIndex } from './get_inference_id_from_write_index';
 import { reIndexKnowledgeBaseWithLock } from './reindex_knowledge_base';
 import { isSemanticTextUnsupportedError } from '../startup_migrations/run_startup_migrations';
-import { isKnowledgeBaseIndexWriteBlocked } from './index_write_block_utils';
 
 interface Dependencies {
   core: CoreSetup<ObservabilityAIAssistantPluginStartDependencies>;
@@ -461,12 +460,6 @@ export class KnowledgeBaseService {
         );
       }
 
-      if (isKnowledgeBaseIndexWriteBlocked(error)) {
-        throw new Error(
-          `Writes to the knowledge base are currently blocked due to an Elasticsearch write index block. This is most likely due to an ongoing re-indexing operation. Please try again later. Error: ${error.message}`
-        );
-      }
-
       throw error;
     }
   };
diff --git a/x-pack/platform/plugins/shared/observability_ai_assistant/server/service/knowledge_base_service/index_write_block_utils.ts b/x-pack/platform/plugins/shared/observability_ai_assistant/server/service/knowledge_base_service/index_write_block_utils.ts
deleted file mode 100644
index 053240191e34d..0000000000000
--- a/x-pack/platform/plugins/shared/observability_ai_assistant/server/service/knowledge_base_service/index_write_block_utils.ts
+++ /dev/null
@@ -1,77 +0,0 @@
-/*
- * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
- * or more contributor license agreements. Licensed under the Elastic License
- * 2.0; you may not use this file except in compliance with the Elastic License
- * 2.0.
- */
-
-import { errors } from '@elastic/elasticsearch';
-import { ElasticsearchClient, Logger } from '@kbn/core/server';
-import pRetry from 'p-retry';
-import { resourceNames } from '..';
-
-export async function addIndexWriteBlock({
-  esClient,
-  index,
-}: {
-  esClient: { asInternalUser: ElasticsearchClient };
-  index: string;
-}) {
-  await esClient.asInternalUser.indices.addBlock({ index, block: 'write' });
-}
-
-export function removeIndexWriteBlock({
-  esClient,
-  index,
-}: {
-  esClient: { asInternalUser: ElasticsearchClient };
-  index: string;
-}) {
-  return esClient.asInternalUser.indices.putSettings({
-    index,
-    body: { 'index.blocks.write': false },
-  });
-}
-
-export async function hasIndexWriteBlock({
-  esClient,
-  index,
-}: {
-  esClient: { asInternalUser: ElasticsearchClient };
-  index: string;
-}) {
-  const response = await esClient.asInternalUser.indices.getSettings({ index });
-  const writeBlockSetting = Object.values(response)[0]?.settings?.index?.blocks?.write;
-  return writeBlockSetting === 'true' || writeBlockSetting === true;
-}
-
-export async function waitForWriteBlockToBeRemoved({
-  esClient,
-  logger,
-  index,
-}: {
-  esClient: { asInternalUser: ElasticsearchClient };
-  logger: Logger;
-  index: string;
-}) {
-  return pRetry(
-    async () => {
-      const isBlocked = await hasIndexWriteBlock({ esClient, index });
-      if (isBlocked) {
-        logger.debug(`Waiting for the write block to be removed from "${index}"...`);
-        throw new Error(
-          'Waiting for the re-index operation to complete and the write block to be removed...'
-        );
-      }
-    },
-    { forever: true, maxTimeout: 10000 }
-  );
-}
-
-export function isKnowledgeBaseIndexWriteBlocked(error: any) {
-  return (
-    error instanceof errors.ResponseError &&
-    error.message.includes(`cluster_block_exception`) &&
-    error.message.includes(resourceNames.writeIndexAlias.kb)
-  );
-}
diff --git a/x-pack/platform/plugins/shared/observability_ai_assistant/server/service/knowledge_base_service/reindex_knowledge_base.ts b/x-pack/platform/plugins/shared/observability_ai_assistant/server/service/knowledge_base_service/reindex_knowledge_base.ts
index 4f11d8cc0ad5f..931c45833cd8b 100644
--- a/x-pack/platform/plugins/shared/observability_ai_assistant/server/service/knowledge_base_service/reindex_knowledge_base.ts
+++ b/x-pack/platform/plugins/shared/observability_ai_assistant/server/service/knowledge_base_service/reindex_knowledge_base.ts
@@ -13,11 +13,6 @@ import { CoreSetup } from '@kbn/core/server';
 import { LockManagerService } from '@kbn/lock-manager';
 import { resourceNames } from '..';
 import { ObservabilityAIAssistantPluginStartDependencies } from '../../types';
-import {
-  addIndexWriteBlock,
-  hasIndexWriteBlock,
-  removeIndexWriteBlock,
-} from './index_write_block_utils';
 import { createKnowledgeBaseIndex } from './create_knowledge_base_index';
 import { updateKnowledgeBaseWriteIndexAlias } from './update_knowledge_base_index_alias';
 
@@ -34,47 +29,13 @@ export async function reIndexKnowledgeBaseWithLock({
     asInternalUser: ElasticsearchClient;
   };
   inferenceId: string;
-}): Promise<boolean> {
+}): Promise<void> {
   const lmService = new LockManagerService(core, logger);
   return lmService.withLock(KB_REINDEXING_LOCK_ID, () =>
-    reIndexKnowledgeBaseWithWriteIndexBlock({
-      logger: logger.get('kb-reindex'),
-      esClient,
-      inferenceId,
-    })
+    reIndexKnowledgeBase({ logger, esClient, inferenceId })
   );
 }
 
-async function reIndexKnowledgeBaseWithWriteIndexBlock({
-  logger,
-  esClient,
-  inferenceId,
-}: {
-  logger: Logger;
-  esClient: { asInternalUser: ElasticsearchClient };
-  inferenceId: string;
-}): Promise<boolean> {
-  logger.debug('Initializing re-indexing of knowledge base...');
-  if (await hasIndexWriteBlock({ esClient, index: resourceNames.writeIndexAlias.kb })) {
-    throw new Error(
-      `Write block is already set on the knowledge base index: ${resourceNames.writeIndexAlias.kb}`
-    );
-  }
-
-  try {
-    await addIndexWriteBlock({ esClient, index: resourceNames.writeIndexAlias.kb });
-    await reIndexKnowledgeBase({ logger, esClient, inferenceId });
-    logger.info('Re-indexing knowledge base completed successfully.');
-  } catch (error) {
-    logger.error(`Re-indexing knowledge base failed: ${error.message}`);
-    throw error;
-  } finally {
-    await removeIndexWriteBlock({ esClient, index: resourceNames.writeIndexAlias.kb });
-  }
-
-  return true;
-}
-
 async function reIndexKnowledgeBase({
   logger,
   esClient,
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/index.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/index.ts
index 06bb2af4d583a..675248c90b09a 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/index.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/index.ts
@@ -32,7 +32,7 @@ export default function aiAssistantApiIntegrationTests({
     loadTestFile(require.resolve('./knowledge_base/knowledge_base_setup.spec.ts'));
     loadTestFile(require.resolve('./knowledge_base/knowledge_base_status.spec.ts'));
     loadTestFile(require.resolve('./knowledge_base/knowledge_base_user_instructions.spec.ts'));
-    loadTestFile(require.resolve('./knowledge_base/knowledge_base.spec.ts'));
+    loadTestFile(require.resolve('./knowledge_base/knowledge_base_basic_operations.spec.ts'));
     loadTestFile(
       require.resolve('./knowledge_base/knowledge_base_change_model_from_elser_to_e5.spec.ts')
     );
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.10_upgrade_test.spec.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.10_upgrade_test.spec.ts
index 534633fa40b13..c833f84d302da 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.10_upgrade_test.spec.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.10_upgrade_test.spec.ts
@@ -33,7 +33,7 @@ export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderCon
   // Sparse vector field was introduced in Elasticsearch 8.11
   // The semantic text field was added to the knowledge base index in 8.17
   // Indices created in 8.10 do not support semantic text field and need to be reindexed
-  describe('when upgrading from 8.10 to 8.18', function () {
+  describe('Knowledge base: when upgrading from 8.10 to 8.18', function () {
     // Intentionally skipped in all serverless environnments (local and MKI)
     // because the migration scenario being tested is not relevant to MKI and Serverless.
     this.tags(['skipServerless']);
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.16_upgrade_test.spec.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.16_upgrade_test.spec.ts
index 498fe75f6d435..55c9cc88406cd 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.16_upgrade_test.spec.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.16_upgrade_test.spec.ts
@@ -34,7 +34,7 @@ export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderCon
   // In 8.16 and earlier embeddings were stored in the `ml.tokens` field
   // In 8.17 `ml.tokens` is replaced with `semantic_text` field and the custom ELSER inference endpoint "obs_ai_assistant_kb_inference" is introduced
   // When upgrading we must ensure that the semantic_text field is populated
-  describe('when upgrading from 8.16 to 8.17', function () {
+  describe('Knowledge base: when upgrading from 8.16 to 8.17', function () {
     // Intentionally skipped in all serverless environnments (local and MKI)
     // because the migration scenario being tested is not relevant to MKI and Serverless.
     this.tags(['skipServerless']);
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.18_upgrade_test.spec.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.18_upgrade_test.spec.ts
index 3ba050327b659..65ef4a2bb0bcf 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.18_upgrade_test.spec.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_8.18_upgrade_test.spec.ts
@@ -35,7 +35,7 @@ export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderCon
   // In 8.19 / 9.1 the custom inference endpoint ("obs_ai_assistant_kb_inference") is replaced with the preconfigured endpoint ".elser-2-elasticsearch"
   // We need to make sure that the custom inference endpoint continues to work after the migration
 
-  describe('when upgrading from 8.18 to 8.19', function () {
+  describe('Knowledge base: when upgrading from 8.18 to 8.19', function () {
     this.tags(['skipServerless']);
 
     before(async () => {
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base.spec.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_basic_operations.spec.ts
similarity index 99%
rename from x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base.spec.ts
rename to x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_basic_operations.spec.ts
index 18c548971b8fd..67b1dc71cea28 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base.spec.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_basic_operations.spec.ts
@@ -44,7 +44,7 @@ export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderCon
     return res.body.entries;
   }
 
-  describe('Knowledge base', function () {
+  describe('Knowledge base: Basic operations', function () {
     before(async () => {
       await deployTinyElserAndSetupKb(getService);
     });
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_change_model_from_elser_to_e5.spec.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_change_model_from_elser_to_e5.spec.ts
index e852a7a79fef1..74a4d94f25f69 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_change_model_from_elser_to_e5.spec.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_change_model_from_elser_to_e5.spec.ts
@@ -42,7 +42,7 @@ export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderCon
 
   type KnowledgeBaseEsEntry = Awaited<ReturnType<typeof getKnowledgeBaseEntriesFromEs>>[0];
 
-  describe('when changing from ELSER to E5-like model', function () {
+  describe('Knowledge base: when changing from ELSER to E5-like model', function () {
     let elserEntriesFromApi: KnowledgeBaseEntry[];
     let elserEntriesFromEs: KnowledgeBaseEsEntry[];
     let elserInferenceId: string;
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_reindex_concurrency.spec.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_reindex_concurrency.spec.ts
index fb9f5ed62cf49..a7f268dc26b77 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_reindex_concurrency.spec.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_reindex_concurrency.spec.ts
@@ -26,7 +26,7 @@ export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderCon
   const observabilityAIAssistantAPIClient = getService('observabilityAIAssistantApi');
   const es = getService('es');
 
-  describe('POST /internal/observability_ai_assistant/kb/reindex', function () {
+  describe('Knowledge base: POST /internal/observability_ai_assistant/kb/reindex', function () {
     // Intentionally skipped in all serverless environnments (local and MKI)
     // because the migration scenario being tested is not relevant to MKI and Serverless.
     this.tags(['skipServerless']);
@@ -82,7 +82,7 @@ export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderCon
 
     const iterations = 5;
     describe(`when running ${iterations} re-index operations in sequence`, () => {
-      let results: Array<{ status: number; result: boolean; errorMessage: string | undefined }>;
+      let results: Array<{ status: number; success: boolean; errorMessage: string | undefined }>;
       let initialIndexSequenceNumber: number;
 
       before(async () => {
@@ -103,7 +103,7 @@ export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderCon
       it('every re-index operation succeeds', async () => {
         const successResults = results.filter((result) => result.status === 200);
         expect(successResults).to.have.length(iterations);
-        expect(successResults.every((r) => r.result === true)).to.be(true);
+        expect(successResults.every((r) => r.success === true)).to.be(true);
       });
 
       it('no requests should fail', async () => {
@@ -126,7 +126,7 @@ export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderCon
 
     return {
       status: res.status,
-      result: res.body.result,
+      success: res.body.success,
       errorMessage: 'message' in res.body ? (res.body.message as string) : undefined,
     };
   }
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_setup.spec.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_setup.spec.ts
index fc39b3b4d2164..3500826d9ead0 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_setup.spec.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_setup.spec.ts
@@ -32,7 +32,7 @@ export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderCon
   const ml = getService('ml');
   const observabilityAIAssistantAPIClient = getService('observabilityAIAssistantApi');
 
-  describe('/internal/observability_ai_assistant/kb/setup', function () {
+  describe('Knowledge base: POST /internal/observability_ai_assistant/kb/setup', function () {
     before(async () => {
       await teardownTinyElserModelAndInferenceEndpoint(getService);
       await restoreIndexAssets(observabilityAIAssistantAPIClient, es);
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_status.spec.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_status.spec.ts
index 07edcbab12704..0fb48f361ffc4 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_status.spec.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_status.spec.ts
@@ -21,10 +21,7 @@ import {
 export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderContext) {
   const observabilityAIAssistantAPIClient = getService('observabilityAIAssistantApi');
 
-  describe('/internal/observability_ai_assistant/kb/status', function () {
-    // see details: https://github.com/elastic/kibana/issues/219217
-    this.tags(['failsOnMKI']);
-
+  describe('Knowledge base: GET /internal/observability_ai_assistant/kb/status', function () {
     it('returns correct status before knowledge base is setup', async () => {
       const res = await observabilityAIAssistantAPIClient.editor({
         endpoint: 'GET /internal/observability_ai_assistant/kb/status',
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_user_instructions.spec.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_user_instructions.spec.ts
index 96055d962fbc4..badc0919922cd 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_user_instructions.spec.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_user_instructions.spec.ts
@@ -31,7 +31,7 @@ export default function ApiTest({ getService }: DeploymentAgnosticFtrProviderCon
   const log = getService('log');
   const retry = getService('retry');
 
-  describe('Knowledge base user instructions', function () {
+  describe('Knowledge base: user instructions', function () {
     before(async () => {
       await deployTinyElserAndSetupKb(getService);
     });
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_warmup_model.spec.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_warmup_model.spec.ts
index 07df98671cfab..1c9ce539e59f1 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_warmup_model.spec.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/knowledge_base/knowledge_base_warmup_model.spec.ts
@@ -38,7 +38,7 @@ export default function WarmupModelApiTest({ getService }: DeploymentAgnosticFtr
     });
   }
 
-  describe('/internal/observability_ai_assistant/kb/warmup_model', function () {
+  describe('Knowledge base: POST /internal/observability_ai_assistant/kb/warmup_model', function () {
     const inferenceId = TINY_ELSER_INFERENCE_ID;
 
     before(async () => {
diff --git a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/utils/knowledge_base.ts b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/utils/knowledge_base.ts
index 0b6667b27e932..5cf451471ca39 100644
--- a/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/utils/knowledge_base.ts
+++ b/x-pack/test/api_integration/deployment_agnostic/apis/observability/ai_assistant/utils/knowledge_base.ts
@@ -162,12 +162,6 @@ export async function getConcreteWriteIndexFromAlias(es: Client) {
   return writeIndex;
 }
 
-export async function hasIndexWriteBlock(es: Client, index: string) {
-  const response = await es.indices.getSettings({ index });
-  const writeBlockSetting = Object.values(response)[0]?.settings?.index?.blocks?.write;
-  return writeBlockSetting === 'true' || writeBlockSetting === true;
-}
-
 export async function getKbIndexCreatedVersion(es: Client) {
   const indexSettings = await es.indices.getSettings({
     index: resourceNames.writeIndexAlias.kb,