diff --git a/x-pack/plugins/infra/server/lib/log_analysis/common.ts b/x-pack/plugins/infra/server/lib/log_analysis/common.ts
index 218281d875a46..4d2be94c7cd62 100644
--- a/x-pack/plugins/infra/server/lib/log_analysis/common.ts
+++ b/x-pack/plugins/infra/server/lib/log_analysis/common.ts
@@ -14,7 +14,6 @@ import {
   logEntryDatasetsResponseRT,
 } from './queries/log_entry_data_sets';
 import { decodeOrThrow } from '../../../common/runtime_types';
-import { NoLogAnalysisResultsIndexError } from './errors';
 import { startTracingSpan, TracingSpan } from '../../../common/performance_tracing';
 
 export async function fetchMlJob(mlAnomalyDetectors: MlAnomalyDetectors, jobId: string) {
@@ -67,16 +66,8 @@ export async function getLogEntryDatasets(
       )
     );
 
-    if (logEntryDatasetsResponse._shards.total === 0) {
-      throw new NoLogAnalysisResultsIndexError(
-        `Failed to find ml indices for jobs: ${jobIds.join(', ')}.`
-      );
-    }
-
-    const {
-      after_key: afterKey,
-      buckets: latestBatchBuckets,
-    } = logEntryDatasetsResponse.aggregations.dataset_buckets;
+    const { after_key: afterKey, buckets: latestBatchBuckets = [] } =
+      logEntryDatasetsResponse.aggregations?.dataset_buckets ?? {};
 
     logEntryDatasetBuckets = [...logEntryDatasetBuckets, ...latestBatchBuckets];
     afterLatestBatchKey = afterKey;
diff --git a/x-pack/plugins/infra/server/lib/log_analysis/errors.ts b/x-pack/plugins/infra/server/lib/log_analysis/errors.ts
index 09fee8844fbc5..a6d0db25084e8 100644
--- a/x-pack/plugins/infra/server/lib/log_analysis/errors.ts
+++ b/x-pack/plugins/infra/server/lib/log_analysis/errors.ts
@@ -6,13 +6,6 @@
 
 /* eslint-disable max-classes-per-file */
 
-export class NoLogAnalysisResultsIndexError extends Error {
-  constructor(message?: string) {
-    super(message);
-    Object.setPrototypeOf(this, new.target.prototype);
-  }
-}
-
 export class NoLogAnalysisMlJobError extends Error {
   constructor(message?: string) {
     super(message);
diff --git a/x-pack/plugins/infra/server/lib/log_analysis/log_entry_categories_analysis.ts b/x-pack/plugins/infra/server/lib/log_analysis/log_entry_categories_analysis.ts
index a455a03d936a5..ff9e3c7d2167c 100644
--- a/x-pack/plugins/infra/server/lib/log_analysis/log_entry_categories_analysis.ts
+++ b/x-pack/plugins/infra/server/lib/log_analysis/log_entry_categories_analysis.ts
@@ -15,11 +15,7 @@ import {
 import { startTracingSpan } from '../../../common/performance_tracing';
 import { decodeOrThrow } from '../../../common/runtime_types';
 import type { MlAnomalyDetectors, MlSystem } from '../../types';
-import {
-  InsufficientLogAnalysisMlJobConfigurationError,
-  NoLogAnalysisResultsIndexError,
-  UnknownCategoryError,
-} from './errors';
+import { InsufficientLogAnalysisMlJobConfigurationError, UnknownCategoryError } from './errors';
 import {
   createLogEntryCategoriesQuery,
   logEntryCategoriesResponseRT,
@@ -235,38 +231,33 @@ async function fetchTopLogEntryCategories(
 
   const esSearchSpan = finalizeEsSearchSpan();
 
-  if (topLogEntryCategoriesResponse._shards.total === 0) {
-    throw new NoLogAnalysisResultsIndexError(
-      `Failed to find ml result index for job ${logEntryCategoriesCountJobId}.`
-    );
-  }
-
-  const topLogEntryCategories = topLogEntryCategoriesResponse.aggregations.terms_category_id.buckets.map(
-    (topCategoryBucket) => {
-      const maximumAnomalyScoresByDataset = topCategoryBucket.filter_record.terms_dataset.buckets.reduce<
-        Record<string, number>
-      >(
-        (accumulatedMaximumAnomalyScores, datasetFromRecord) => ({
-          ...accumulatedMaximumAnomalyScores,
-          [datasetFromRecord.key]: datasetFromRecord.maximum_record_score.value ?? 0,
-        }),
-        {}
-      );
-
-      return {
-        categoryId: parseCategoryId(topCategoryBucket.key),
-        logEntryCount: topCategoryBucket.filter_model_plot.sum_actual.value ?? 0,
-        datasets: topCategoryBucket.filter_model_plot.terms_dataset.buckets
-          .map((datasetBucket) => ({
-            name: datasetBucket.key,
-            maximumAnomalyScore: maximumAnomalyScoresByDataset[datasetBucket.key] ?? 0,
-          }))
-          .sort(compareDatasetsByMaximumAnomalyScore)
-          .reverse(),
-        maximumAnomalyScore: topCategoryBucket.filter_record.maximum_record_score.value ?? 0,
-      };
-    }
-  );
+  const topLogEntryCategories =
+    topLogEntryCategoriesResponse.aggregations?.terms_category_id.buckets.map(
+      (topCategoryBucket) => {
+        const maximumAnomalyScoresByDataset = topCategoryBucket.filter_record.terms_dataset.buckets.reduce<
+          Record<string, number>
+        >(
+          (accumulatedMaximumAnomalyScores, datasetFromRecord) => ({
+            ...accumulatedMaximumAnomalyScores,
+            [datasetFromRecord.key]: datasetFromRecord.maximum_record_score.value ?? 0,
+          }),
+          {}
+        );
+
+        return {
+          categoryId: parseCategoryId(topCategoryBucket.key),
+          logEntryCount: topCategoryBucket.filter_model_plot.sum_actual.value ?? 0,
+          datasets: topCategoryBucket.filter_model_plot.terms_dataset.buckets
+            .map((datasetBucket) => ({
+              name: datasetBucket.key,
+              maximumAnomalyScore: maximumAnomalyScoresByDataset[datasetBucket.key] ?? 0,
+            }))
+            .sort(compareDatasetsByMaximumAnomalyScore)
+            .reverse(),
+          maximumAnomalyScore: topCategoryBucket.filter_record.maximum_record_score.value ?? 0,
+        };
+      }
+    ) ?? [];
 
   return {
     topLogEntryCategories,
diff --git a/x-pack/plugins/infra/server/lib/log_analysis/log_entry_rate_analysis.ts b/x-pack/plugins/infra/server/lib/log_analysis/log_entry_rate_analysis.ts
index 7bfc85ba78a0e..ce3acd0dba8cf 100644
--- a/x-pack/plugins/infra/server/lib/log_analysis/log_entry_rate_analysis.ts
+++ b/x-pack/plugins/infra/server/lib/log_analysis/log_entry_rate_analysis.ts
@@ -4,10 +4,7 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 
-import { pipe } from 'fp-ts/lib/pipeable';
-import { map, fold } from 'fp-ts/lib/Either';
-import { identity } from 'fp-ts/lib/function';
-import { throwErrors, createPlainError } from '../../../common/runtime_types';
+import { decodeOrThrow } from '../../../common/runtime_types';
 import {
   logRateModelPlotResponseRT,
   createLogEntryRateQuery,
@@ -15,7 +12,6 @@ import {
   CompositeTimestampPartitionKey,
 } from './queries';
 import { getJobId } from '../../../common/log_analysis';
-import { NoLogAnalysisResultsIndexError } from './errors';
 import type { MlSystem } from '../../types';
 
 const COMPOSITE_AGGREGATION_BATCH_SIZE = 1000;
@@ -50,22 +46,14 @@ export async function getLogEntryRateBuckets(
       )
     );
 
-    if (mlModelPlotResponse._shards.total === 0) {
-      throw new NoLogAnalysisResultsIndexError(
-        `Failed to query ml result index for job ${logRateJobId}.`
-      );
-    }
-
-    const { after_key: afterKey, buckets: latestBatchBuckets } = pipe(
-      logRateModelPlotResponseRT.decode(mlModelPlotResponse),
-      map((response) => response.aggregations.timestamp_partition_buckets),
-      fold(throwErrors(createPlainError), identity)
-    );
+    const { after_key: afterKey, buckets: latestBatchBuckets = [] } =
+      decodeOrThrow(logRateModelPlotResponseRT)(mlModelPlotResponse).aggregations
+        ?.timestamp_partition_buckets ?? {};
 
     mlModelPlotBuckets = [...mlModelPlotBuckets, ...latestBatchBuckets];
     afterLatestBatchKey = afterKey;
 
-    if (latestBatchBuckets.length < COMPOSITE_AGGREGATION_BATCH_SIZE) {
+    if (afterKey == null || latestBatchBuckets.length < COMPOSITE_AGGREGATION_BATCH_SIZE) {
       break;
     }
   }
diff --git a/x-pack/plugins/infra/server/lib/log_analysis/queries/log_entry_data_sets.ts b/x-pack/plugins/infra/server/lib/log_analysis/queries/log_entry_data_sets.ts
index 7627ccd8c4996..53971a91d86b1 100644
--- a/x-pack/plugins/infra/server/lib/log_analysis/queries/log_entry_data_sets.ts
+++ b/x-pack/plugins/infra/server/lib/log_analysis/queries/log_entry_data_sets.ts
@@ -67,7 +67,7 @@ export type LogEntryDatasetBucket = rt.TypeOf<typeof logEntryDatasetBucketRT>;
 
 export const logEntryDatasetsResponseRT = rt.intersection([
   commonSearchSuccessResponseFieldsRT,
-  rt.type({
+  rt.partial({
     aggregations: rt.type({
       dataset_buckets: rt.intersection([
         rt.type({
diff --git a/x-pack/plugins/infra/server/lib/log_analysis/queries/log_entry_rate.ts b/x-pack/plugins/infra/server/lib/log_analysis/queries/log_entry_rate.ts
index 52edcf09cdfc2..e82dd8ef4443c 100644
--- a/x-pack/plugins/infra/server/lib/log_analysis/queries/log_entry_rate.ts
+++ b/x-pack/plugins/infra/server/lib/log_analysis/queries/log_entry_rate.ts
@@ -162,7 +162,7 @@ export const logRateModelPlotBucketRT = rt.type({
 
 export type LogRateModelPlotBucket = rt.TypeOf<typeof logRateModelPlotBucketRT>;
 
-export const logRateModelPlotResponseRT = rt.type({
+export const logRateModelPlotResponseRT = rt.partial({
   aggregations: rt.type({
     timestamp_partition_buckets: rt.intersection([
       rt.type({
diff --git a/x-pack/plugins/infra/server/lib/log_analysis/queries/top_log_entry_categories.ts b/x-pack/plugins/infra/server/lib/log_analysis/queries/top_log_entry_categories.ts
index 355dde9ec7c4a..5d3d9bc8b4036 100644
--- a/x-pack/plugins/infra/server/lib/log_analysis/queries/top_log_entry_categories.ts
+++ b/x-pack/plugins/infra/server/lib/log_analysis/queries/top_log_entry_categories.ts
@@ -159,7 +159,7 @@ export type LogEntryCategoryBucket = rt.TypeOf<typeof logEntryCategoryBucketRT>;
 
 export const topLogEntryCategoriesResponseRT = rt.intersection([
   commonSearchSuccessResponseFieldsRT,
-  rt.type({
+  rt.partial({
     aggregations: rt.type({
       terms_category_id: rt.type({
         buckets: rt.array(logEntryCategoryBucketRT),
diff --git a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_anomalies_datasets.ts b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_anomalies_datasets.ts
index d3d0862eee9aa..f1f1a1681a901 100644
--- a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_anomalies_datasets.ts
+++ b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_anomalies_datasets.ts
@@ -12,10 +12,7 @@ import {
 } from '../../../../common/http_api/log_analysis';
 import { createValidationFunction } from '../../../../common/runtime_types';
 import type { InfraBackendLibs } from '../../../lib/infra_types';
-import {
-  getLogEntryAnomaliesDatasets,
-  NoLogAnalysisResultsIndexError,
-} from '../../../lib/log_analysis';
+import { getLogEntryAnomaliesDatasets } from '../../../lib/log_analysis';
 import { assertHasInfraMlPlugins } from '../../../utils/request_context';
 
 export const initGetLogEntryAnomaliesDatasetsRoute = ({ framework }: InfraBackendLibs) => {
@@ -58,10 +55,6 @@ export const initGetLogEntryAnomaliesDatasetsRoute = ({ framework }: InfraBacken
           throw error;
         }
 
-        if (error instanceof NoLogAnalysisResultsIndexError) {
-          return response.notFound({ body: { message: error.message } });
-        }
-
         return response.customError({
           statusCode: error.statusCode ?? 500,
           body: {
diff --git a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_categories.ts b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_categories.ts
index f9f31f28dffeb..f57132ef1b505 100644
--- a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_categories.ts
+++ b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_categories.ts
@@ -12,10 +12,7 @@ import {
 } from '../../../../common/http_api/log_analysis';
 import { createValidationFunction } from '../../../../common/runtime_types';
 import type { InfraBackendLibs } from '../../../lib/infra_types';
-import {
-  getTopLogEntryCategories,
-  NoLogAnalysisResultsIndexError,
-} from '../../../lib/log_analysis';
+import { getTopLogEntryCategories } from '../../../lib/log_analysis';
 import { assertHasInfraMlPlugins } from '../../../utils/request_context';
 
 export const initGetLogEntryCategoriesRoute = ({ framework }: InfraBackendLibs) => {
@@ -69,10 +66,6 @@ export const initGetLogEntryCategoriesRoute = ({ framework }: InfraBackendLibs)
           throw error;
         }
 
-        if (error instanceof NoLogAnalysisResultsIndexError) {
-          return response.notFound({ body: { message: error.message } });
-        }
-
         return response.customError({
           statusCode: error.statusCode ?? 500,
           body: {
diff --git a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_category_datasets.ts b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_category_datasets.ts
index 69b1e942464fd..b99ff920f81e4 100644
--- a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_category_datasets.ts
+++ b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_category_datasets.ts
@@ -12,10 +12,7 @@ import {
 } from '../../../../common/http_api/log_analysis';
 import { createValidationFunction } from '../../../../common/runtime_types';
 import type { InfraBackendLibs } from '../../../lib/infra_types';
-import {
-  getLogEntryCategoryDatasets,
-  NoLogAnalysisResultsIndexError,
-} from '../../../lib/log_analysis';
+import { getLogEntryCategoryDatasets } from '../../../lib/log_analysis';
 import { assertHasInfraMlPlugins } from '../../../utils/request_context';
 
 export const initGetLogEntryCategoryDatasetsRoute = ({ framework }: InfraBackendLibs) => {
@@ -58,10 +55,6 @@ export const initGetLogEntryCategoryDatasetsRoute = ({ framework }: InfraBackend
           throw error;
         }
 
-        if (error instanceof NoLogAnalysisResultsIndexError) {
-          return response.notFound({ body: { message: error.message } });
-        }
-
         return response.customError({
           statusCode: error.statusCode ?? 500,
           body: {
diff --git a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_category_examples.ts b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_category_examples.ts
index 8baeaac3d1699..11098ebe5c65b 100644
--- a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_category_examples.ts
+++ b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_category_examples.ts
@@ -12,10 +12,7 @@ import {
 } from '../../../../common/http_api/log_analysis';
 import { createValidationFunction } from '../../../../common/runtime_types';
 import type { InfraBackendLibs } from '../../../lib/infra_types';
-import {
-  getLogEntryCategoryExamples,
-  NoLogAnalysisResultsIndexError,
-} from '../../../lib/log_analysis';
+import { getLogEntryCategoryExamples } from '../../../lib/log_analysis';
 import { assertHasInfraMlPlugins } from '../../../utils/request_context';
 
 export const initGetLogEntryCategoryExamplesRoute = ({ framework, sources }: InfraBackendLibs) => {
@@ -68,10 +65,6 @@ export const initGetLogEntryCategoryExamplesRoute = ({ framework, sources }: Inf
           throw error;
         }
 
-        if (error instanceof NoLogAnalysisResultsIndexError) {
-          return response.notFound({ body: { message: error.message } });
-        }
-
         return response.customError({
           statusCode: error.statusCode ?? 500,
           body: {
diff --git a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_examples.ts b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_examples.ts
index be4caee769506..7838a64a6045e 100644
--- a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_examples.ts
+++ b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_examples.ts
@@ -7,7 +7,7 @@
 import Boom from 'boom';
 import { createValidationFunction } from '../../../../common/runtime_types';
 import { InfraBackendLibs } from '../../../lib/infra_types';
-import { NoLogAnalysisResultsIndexError, getLogEntryExamples } from '../../../lib/log_analysis';
+import { getLogEntryExamples } from '../../../lib/log_analysis';
 import { assertHasInfraMlPlugins } from '../../../utils/request_context';
 import {
   getLogEntryExamplesRequestPayloadRT,
@@ -68,10 +68,6 @@ export const initGetLogEntryExamplesRoute = ({ framework, sources }: InfraBacken
           throw error;
         }
 
-        if (error instanceof NoLogAnalysisResultsIndexError) {
-          return response.notFound({ body: { message: error.message } });
-        }
-
         return response.customError({
           statusCode: error.statusCode ?? 500,
           body: {
diff --git a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_rate.ts b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_rate.ts
index 3b05f6ed23aae..cd23c0193e291 100644
--- a/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_rate.ts
+++ b/x-pack/plugins/infra/server/routes/log_analysis/results/log_entry_rate.ts
@@ -13,7 +13,7 @@ import {
   GetLogEntryRateSuccessResponsePayload,
 } from '../../../../common/http_api/log_analysis';
 import { createValidationFunction } from '../../../../common/runtime_types';
-import { NoLogAnalysisResultsIndexError, getLogEntryRateBuckets } from '../../../lib/log_analysis';
+import { getLogEntryRateBuckets } from '../../../lib/log_analysis';
 import { assertHasInfraMlPlugins } from '../../../utils/request_context';
 
 export const initGetLogEntryRateRoute = ({ framework }: InfraBackendLibs) => {
@@ -56,10 +56,6 @@ export const initGetLogEntryRateRoute = ({ framework }: InfraBackendLibs) => {
           throw error;
         }
 
-        if (error instanceof NoLogAnalysisResultsIndexError) {
-          return response.notFound({ body: { message: error.message } });
-        }
-
         return response.customError({
           statusCode: error.statusCode ?? 500,
           body: {