diff --git a/core/src/main/java/org/opensearch/sql/analysis/NestedAnalyzer.java b/core/src/main/java/org/opensearch/sql/analysis/NestedAnalyzer.java
index ee540c74ae..756c1f20b3 100644
--- a/core/src/main/java/org/opensearch/sql/analysis/NestedAnalyzer.java
+++ b/core/src/main/java/org/opensearch/sql/analysis/NestedAnalyzer.java
@@ -100,7 +100,6 @@ private void validateArgs(List<UnresolvedExpression> args) {
     }
   }
 
-
   /**
    * Generate nested path dynamically. Assumes at least one level of nesting in supplied string.
    * @param field : Nested field to generate path of.
diff --git a/core/src/main/java/org/opensearch/sql/executor/QueryService.java b/core/src/main/java/org/opensearch/sql/executor/QueryService.java
index 494de68919..94e7081920 100644
--- a/core/src/main/java/org/opensearch/sql/executor/QueryService.java
+++ b/core/src/main/java/org/opensearch/sql/executor/QueryService.java
@@ -97,7 +97,6 @@ public LogicalPlan analyze(UnresolvedPlan plan) {
    * Translate {@link LogicalPlan} to {@link PhysicalPlan}.
    */
   public PhysicalPlan plan(LogicalPlan plan) {
-    var ret = planner.plan(plan);
-    return ret;
+    return planner.plan(plan);
   }
 }
diff --git a/docs/dev/index.md b/docs/dev/index.md
deleted file mode 100644
index 796698afc2..0000000000
--- a/docs/dev/index.md
+++ /dev/null
@@ -1,71 +0,0 @@
-
-# OpenSearch SQL/PPL Engine Development Manual
-
-## Introduction
-
-+ [Architecture](intro-architecture.md): a quick overview of architecture
-+ [V2 Engine](intro-v2-engine.md): introduces why we developed new V2 engine
-+ Concepts
-+ Quickstart
-
----
-## Clients
-
-+ **CLI**
-+ **JDBC Driver**
-+ **ODBC Driver**
-+ **Query Workbench**
-
----
-## Deployment
-
-+ **Standalone Mode**
-+ **OpenSearch Cluster**
-
----
-## Programming Guides
-
-+ **API**
-+ **JavaDoc**
-
----
-## Development Guides
-
-### Language Processing
-
-+ **SQL**
-  + [Aggregate Window Function](sql-aggregate-window-function.md): aggregate window function support
-  + [Nested Function In Where Clause](sql-nested-function-where-clause.md): Nested function support in sql where clause
-+ **Piped Processing Language**
-
-### Query Processing
-
-+ **Query Analyzing**
-  + [Semantic Analysis](query-semantic-analysis.md): performs semantic analysis to ensure semantic correctness
-  + [Type Conversion](query-type-conversion.md): implement implicit data type conversion
-+ **Query Planning**
-  + [Logical Optimization](query-optimizier-improvement.md): improvement on logical optimizer and physical implementer
-+ **Query Execution**
-  + [Query Manager](query-manager.md): query management
-+ **Query Acceleration**
-  + [Automatic Acceleration](query-automatic-acceleration.md): workload based automatic query acceleration proposal
-
-### Data Sources
-
-+ **OpenSearch**
-  + [Relevancy Search](opensearch-relevancy-search.md): OpenSearch relevancy search functions
-  + [Sub Queries](opensearch-nested-field-subquery.md): support sub queries on OpenSearch nested field
-  + [Pagination](opensearch-pagination.md): pagination implementation by OpenSearch scroll API
-+ [Prometheus](datasource-prometheus.md): Prometheus query federation
-+ **File System**
-  + [Querying S3](datasource-query-s3.md): S3 query federation proposal
-
----
-## Other Documents
-
-+ **Test Framework**
-  + [Doc Test](testing-doctest.md): makes our doc live and runnable to ensure documentation correctness
-  + [Comparison Test](testing-comparison-test.md): compares with other databases to ensure functional correctness
-+ **Benchmark**
-  + [Hash Join Benchmark](testing-hash-join-benchmark.md): performance test on hash join implementation
-+ **Operation Tools**
\ No newline at end of file