diff --git a/README.md b/README.md
index a5cd988f87f..9bd6ee4c888 100644
--- a/README.md
+++ b/README.md
@@ -58,7 +58,7 @@ In order to deploy both the stacks the user needs to provide a set of required a
 | account (Optional)                | string  | User provided aws account                                                                                                                                                                                                                                                                        |
 | dataNodeStorage (Optional)        | string  | User provided ebs block storage size, defaults to 100Gb                                                                                                                                                                                                                                          |
 | mlNodeStorage (Optional)          | string  | User provided ebs block storage size, defaults to 100Gb                                                                                                                                                                                                                                          |
-| jvmHeapSize (Optional)            | integer | User provided JVM heap memory size (integer) in Gb, defaults to 1Gb, e.g. `--context jvmHeapSize=2` to set heap to 2Gb                                                                                                                                                                           |
+| use50PercentHeap (Optional)       | boolean | Boolean flag to use 50% of physical memory as heap. Default is 1GB.  e.g., `--context use50PercentHeap=true`                                                                                                                                                                                                     |
 
 
 
diff --git a/lib/infra/infra-stack.ts b/lib/infra/infra-stack.ts
index 74a05fc34a3..3350cae586b 100644
--- a/lib/infra/infra-stack.ts
+++ b/lib/infra/infra-stack.ts
@@ -55,7 +55,7 @@ export interface infraProps extends StackProps{
     readonly mlNodeStorage: number,
     readonly jvmSysPropsString?: string,
     readonly additionalConfig?: string,
-    readonly jvmHeapSize?: number,
+    readonly use50PercentHeap: boolean,
 }
 
 export class InfraStack extends Stack {
@@ -471,11 +471,13 @@ export class InfraStack extends Stack {
 
     // Check if JVM Heap Memory is set. Default is 1G in the jvm.options file
     // @ts-ignore
-    if (props.jvmHeapSize > 1) {
-      const minHeap = `-Xms${props.jvmHeapSize}g`;
-      const maxHeap = `-Xmx${props.jvmHeapSize}g`;
-      cfnInitConfig.push(InitCommand.shellCommand(`set -ex; cd opensearch; sed -i -e "s/^-Xms[0-9a-z]*$/${minHeap}/g" config/jvm.options;
-      sed -i -e "s/^-Xmx[0-9a-z]*$/${maxHeap}/g" config/jvm.options;`, {
+    if (props.use50PercentHeap) {
+      cfnInitConfig.push(InitCommand.shellCommand(`set -ex; cd opensearch;
+      totalMem=\`expr $(free -g | awk '/^Mem:/{print $2}') + 1\`;
+      heapSizeInGb=\`expr $totalMem / 2\`;
+      if [ $heapSizeInGb -lt 32 ];then minHeap="-Xms"$heapSizeInGb"g";maxHeap="-Xmx"$heapSizeInGb"g";else minHeap="-Xms32g";maxHeap="-Xmx32g";fi
+      sed -i -e "s/^-Xms[0-9a-z]*$/$minHeap/g" config/jvm.options;
+      sed -i -e "s/^-Xmx[0-9a-z]*$/$maxHeap/g" config/jvm.options;`, {
         cwd: '/home/ec2-user',
         ignoreErrors: false,
       }));
diff --git a/lib/os-cluster-entrypoint.ts b/lib/os-cluster-entrypoint.ts
index 93c51c6d4c9..c9de89d6b87 100644
--- a/lib/os-cluster-entrypoint.ts
+++ b/lib/os-cluster-entrypoint.ts
@@ -37,7 +37,6 @@ export class OsClusterEntrypoint {
       let dataNodeStorage: number;
       let mlNodeStorage: number;
       let ymlConfig: string = 'undefined';
-      let jvmHeapSize: number = 1;
 
       const vpcId: string = scope.node.tryGetContext('vpcId');
       const securityGroupId = scope.node.tryGetContext('securityGroupId');
@@ -149,13 +148,8 @@ export class OsClusterEntrypoint {
 
       const suffix = `${scope.node.tryGetContext('suffix')}`;
 
-      const heapSize = `${scope.node.tryGetContext('jvmHeapSize')}`;
-      if (heapSize !== 'undefined') {
-        jvmHeapSize = parseInt(heapSize, 10);
-        if (Number.isNaN(jvmHeapSize)) {
-          throw new Error('heapSize parameter has to be a number');
-        }
-      }
+      const use50heap = `${scope.node.tryGetContext('use50PercentHeap')}`;
+      const use50PercentHeap = use50heap === 'true';
 
       const network = new NetworkStack(scope, 'opensearch-network-stack', {
         cidrBlock: cidrRange,
@@ -201,7 +195,7 @@ export class OsClusterEntrypoint {
         mlNodeStorage,
         jvmSysPropsString: jvmSysProps,
         additionalConfig: ymlConfig,
-        jvmHeapSize,
+        use50PercentHeap,
         ...props,
       });