diff --git a/apm-commons/apm-util/src/main/java/org/apache/skywalking/apm/util/PropertyPlaceholderHelper.java b/apm-commons/apm-util/src/main/java/org/apache/skywalking/apm/util/PropertyPlaceholderHelper.java
index 4e985bafb9bace1375a6869686291c8cbe61c66a..c12661cb92cc451929a6b35270efcaadd46310d2 100644
--- a/apm-commons/apm-util/src/main/java/org/apache/skywalking/apm/util/PropertyPlaceholderHelper.java
+++ b/apm-commons/apm-util/src/main/java/org/apache/skywalking/apm/util/PropertyPlaceholderHelper.java
@@ -31,7 +31,11 @@ import java.util.Set;
  */
 public enum PropertyPlaceholderHelper {
 
-    INSTANCE(PlaceholderConfigurerSupport.DEFAULT_PLACEHOLDER_PREFIX, PlaceholderConfigurerSupport.DEFAULT_PLACEHOLDER_SUFFIX, PlaceholderConfigurerSupport.DEFAULT_VALUE_SEPARATOR, true);
+    INSTANCE(
+        PlaceholderConfigurerSupport.DEFAULT_PLACEHOLDER_PREFIX,
+        PlaceholderConfigurerSupport.DEFAULT_PLACEHOLDER_SUFFIX, PlaceholderConfigurerSupport.DEFAULT_VALUE_SEPARATOR,
+        true
+    );
 
     private final String placeholderPrefix;
 
@@ -54,7 +58,7 @@ public enum PropertyPlaceholderHelper {
      *                                       true}) or cause an exception ({@code false})
      */
     PropertyPlaceholderHelper(String placeholderPrefix, String placeholderSuffix, String valueSeparator,
-        boolean ignoreUnresolvablePlaceholders) {
+                              boolean ignoreUnresolvablePlaceholders) {
         if (StringUtil.isEmpty(placeholderPrefix) || StringUtil.isEmpty(placeholderSuffix)) {
             throw new UnsupportedOperationException("'placeholderPrefix or placeholderSuffix' must not be null");
         }
@@ -89,17 +93,17 @@ public enum PropertyPlaceholderHelper {
         return replacePlaceholders(value, new PlaceholderResolver() {
             @Override
             public String resolvePlaceholder(String placeholderName) {
-                return PropertyPlaceholderHelper.this.getConfigValue(placeholderName, properties);
+                return getConfigValue(placeholderName, properties);
             }
         });
     }
 
     private String getConfigValue(String key, final Properties properties) {
         String value = System.getProperty(key);
-        if (StringUtil.isEmpty(value)) {
+        if (value == null) {
             value = System.getenv(key);
         }
-        if (StringUtil.isEmpty(value)) {
+        if (value == null) {
             value = properties.getProperty(key);
         }
         return value;
@@ -118,7 +122,7 @@ public enum PropertyPlaceholderHelper {
     }
 
     protected String parseStringValue(String value, PlaceholderResolver placeholderResolver,
-        Set<String> visitedPlaceholders) {
+                                      Set<String> visitedPlaceholders) {
 
         StringBuilder result = new StringBuilder(value);
 
@@ -129,7 +133,8 @@ public enum PropertyPlaceholderHelper {
                 String placeholder = result.substring(startIndex + this.placeholderPrefix.length(), endIndex);
                 String originalPlaceholder = placeholder;
                 if (!visitedPlaceholders.add(originalPlaceholder)) {
-                    throw new IllegalArgumentException("Circular placeholder reference '" + originalPlaceholder + "' in property definitions");
+                    throw new IllegalArgumentException(
+                        "Circular placeholder reference '" + originalPlaceholder + "' in property definitions");
                 }
                 // Recursive invocation, parsing placeholders contained in the placeholder key.
                 placeholder = parseStringValue(placeholder, placeholderResolver, visitedPlaceholders);
@@ -156,7 +161,8 @@ public enum PropertyPlaceholderHelper {
                     // Proceed with unprocessed value.
                     startIndex = result.indexOf(this.placeholderPrefix, endIndex + this.placeholderSuffix.length());
                 } else {
-                    throw new IllegalArgumentException("Could not resolve placeholder '" + placeholder + "'" + " in value \"" + value + "\"");
+                    throw new IllegalArgumentException(
+                        "Could not resolve placeholder '" + placeholder + "'" + " in value \"" + value + "\"");
                 }
                 visitedPlaceholders.remove(originalPlaceholder);
             } else {
diff --git a/oap-server/server-bootstrap/src/main/java/org/apache/skywalking/oap/server/starter/config/ApplicationConfigLoader.java b/oap-server/server-bootstrap/src/main/java/org/apache/skywalking/oap/server/starter/config/ApplicationConfigLoader.java
index cd612f374282f8987b3ea08e19c330c2c8e0700f..31c874dd1fc54a1af430485aaa4aeb8f6d19fab7 100644
--- a/oap-server/server-bootstrap/src/main/java/org/apache/skywalking/oap/server/starter/config/ApplicationConfigLoader.java
+++ b/oap-server/server-bootstrap/src/main/java/org/apache/skywalking/oap/server/starter/config/ApplicationConfigLoader.java
@@ -24,13 +24,12 @@ import java.util.HashSet;
 import java.util.Map;
 import java.util.Properties;
 import java.util.Set;
+import lombok.extern.slf4j.Slf4j;
 import org.apache.skywalking.apm.util.PropertyPlaceholderHelper;
 import org.apache.skywalking.oap.server.library.module.ApplicationConfiguration;
 import org.apache.skywalking.oap.server.library.module.ProviderNotFoundException;
 import org.apache.skywalking.oap.server.library.util.CollectionUtils;
 import org.apache.skywalking.oap.server.library.util.ResourceUtils;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import org.yaml.snakeyaml.Yaml;
 
 /**
@@ -39,10 +38,8 @@ import org.yaml.snakeyaml.Yaml;
  * <p>
  * At last, override setting by system.properties and system.envs if the key matches moduleName.provideName.settingKey.
  */
+@Slf4j
 public class ApplicationConfigLoader implements ConfigLoader<ApplicationConfiguration> {
-
-    private static final Logger logger = LoggerFactory.getLogger(ApplicationConfigLoader.class);
-
     private static final String DISABLE_SELECTOR = "-";
     private static final String SELECTOR = "selector";
 
@@ -65,10 +62,14 @@ public class ApplicationConfigLoader implements ConfigLoader<ApplicationConfigur
                 selectConfig(moduleConfig);
                 moduleConfig.forEach((moduleName, providerConfig) -> {
                     if (providerConfig.size() > 0) {
-                        logger.info("Get a module define from application.yml, module name: {}", moduleName);
-                        ApplicationConfiguration.ModuleConfiguration moduleConfiguration = configuration.addModule(moduleName);
+                        log.info("Get a module define from application.yml, module name: {}", moduleName);
+                        ApplicationConfiguration.ModuleConfiguration moduleConfiguration = configuration.addModule(
+                            moduleName);
                         providerConfig.forEach((providerName, config) -> {
-                            logger.info("Get a provider define belong to {} module, provider name: {}", moduleName, providerName);
+                            log.info(
+                                "Get a provider define belong to {} module, provider name: {}", moduleName,
+                                providerName
+                            );
                             final Map<String, ?> propertiesConfig = (Map<String, ?>) config;
                             final Properties properties = new Properties();
                             if (propertiesConfig != null) {
@@ -89,7 +90,10 @@ public class ApplicationConfigLoader implements ConfigLoader<ApplicationConfigur
                             moduleConfiguration.addProviderConfiguration(providerName, properties);
                         });
                     } else {
-                        logger.warn("Get a module define from application.yml, but no provider define, use default, module name: {}", moduleName);
+                        log.warn(
+                            "Get a module define from application.yml, but no provider define, use default, module name: {}",
+                            moduleName
+                        );
                     }
                 });
             }
@@ -99,11 +103,26 @@ public class ApplicationConfigLoader implements ConfigLoader<ApplicationConfigur
     }
 
     private void replacePropertyAndLog(final Object propertyName, final Object propertyValue, final Properties target,
-        final Object providerName) {
-        final Object replaceValue = yaml.load(PropertyPlaceholderHelper.INSTANCE.replacePlaceholders(propertyValue + "", target));
-        if (replaceValue != null) {
-            target.replace(propertyName, replaceValue);
-            logger.info("The property with key: {}, value: {}, in {} provider", propertyName, replaceValue.toString(), providerName);
+                                       final Object providerName) {
+        final String valueString = PropertyPlaceholderHelper.INSTANCE
+            .replacePlaceholders(propertyValue + "", target);
+        if (valueString != null) {
+            if (valueString.trim().length() == 0) {
+                target.replace(propertyName, valueString);
+                log.info("Provider={} config={} has been set as an empty string", providerName, propertyName);
+            } else {
+                // Use YAML to do data type conversion.
+                final Object replaceValue = yaml.load(valueString);
+                if (replaceValue != null) {
+                    target.replace(propertyName, replaceValue);
+                    log.info(
+                        "Provider={} config={} has been set as {}",
+                        providerName,
+                        propertyName,
+                        replaceValue.toString()
+                    );
+                }
+            }
         }
     }
 
@@ -148,7 +167,7 @@ public class ApplicationConfigLoader implements ConfigLoader<ApplicationConfigur
             final boolean shouldBeRemoved = modulesWithoutProvider.contains(module);
 
             if (shouldBeRemoved) {
-                logger.info("Remove module {} without any provider", module);
+                log.info("Remove module {} without any provider", module);
             }
 
             return shouldBeRemoved;
@@ -162,7 +181,8 @@ public class ApplicationConfigLoader implements ConfigLoader<ApplicationConfigur
         }
         String moduleName = key.substring(0, moduleAndConfigSeparator);
         String providerSettingSubKey = key.substring(moduleAndConfigSeparator + 1);
-        ApplicationConfiguration.ModuleConfiguration moduleConfiguration = configuration.getModuleConfiguration(moduleName);
+        ApplicationConfiguration.ModuleConfiguration moduleConfiguration = configuration.getModuleConfiguration(
+            moduleName);
         if (moduleConfiguration == null) {
             return;
         }
@@ -193,6 +213,9 @@ public class ApplicationConfigLoader implements ConfigLoader<ApplicationConfigur
             return;
         }
 
-        logger.info("The setting has been override by key: {}, value: {}, in {} provider of {} module through {}", settingKey, value, providerName, moduleName, "System.properties");
+        log.info(
+            "The setting has been override by key: {}, value: {}, in {} provider of {} module through {}", settingKey,
+            value, providerName, moduleName, "System.properties"
+        );
     }
 }
diff --git a/oap-server/server-bootstrap/src/main/resources/application.yml b/oap-server/server-bootstrap/src/main/resources/application.yml
index baa1f8178a35d9bb021edf18436d878b20a31565..4e715ac474f15cb5916e43cabd5355ae068fb85f 100755
--- a/oap-server/server-bootstrap/src/main/resources/application.yml
+++ b/oap-server/server-bootstrap/src/main/resources/application.yml
@@ -92,8 +92,8 @@ storage:
     nameSpace: ${SW_NAMESPACE:""}
     clusterNodes: ${SW_STORAGE_ES_CLUSTER_NODES:localhost:9200}
     protocol: ${SW_STORAGE_ES_HTTP_PROTOCOL:"http"}
-    trustStorePath: ${SW_SW_STORAGE_ES_SSL_JKS_PATH:""}
-    trustStorePass: ${SW_SW_STORAGE_ES_SSL_JKS_PASS:""}
+    trustStorePath: ${SW_STORAGE_ES_SSL_JKS_PATH:""}
+    trustStorePass: ${SW_STORAGE_ES_SSL_JKS_PASS:""}
     user: ${SW_ES_USER:""}
     password: ${SW_ES_PASSWORD:""}
     secretsManagementFile: ${SW_ES_SECRETS_MANAGEMENT_FILE:""} # Secrets management file in the properties format includes the username, password, which are managed by 3rd party tool.
@@ -113,8 +113,8 @@ storage:
     nameSpace: ${SW_NAMESPACE:""}
     clusterNodes: ${SW_STORAGE_ES_CLUSTER_NODES:localhost:9200}
     protocol: ${SW_STORAGE_ES_HTTP_PROTOCOL:"http"}
-    trustStorePath: ${SW_SW_STORAGE_ES_SSL_JKS_PATH:"../es_keystore.jks"}
-    trustStorePass: ${SW_SW_STORAGE_ES_SSL_JKS_PASS:""}
+    trustStorePath: ${SW_STORAGE_ES_SSL_JKS_PATH:""}
+    trustStorePass: ${SW_STORAGE_ES_SSL_JKS_PASS:""}
     dayStep: ${SW_STORAGE_DAY_STEP:1} # Represent the number of days in the one minute/hour/day index.
     user: ${SW_ES_USER:""}
     password: ${SW_ES_PASSWORD:""}
diff --git a/oap-server/server-storage-plugin/storage-elasticsearch-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/elasticsearch/StorageModuleElasticsearchConfig.java b/oap-server/server-storage-plugin/storage-elasticsearch-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/elasticsearch/StorageModuleElasticsearchConfig.java
index 43252127ae94d40830181bddb83f75052ff739f9..39a632523280fc055f23a84306ce3eca72c0826a 100644
--- a/oap-server/server-storage-plugin/storage-elasticsearch-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/elasticsearch/StorageModuleElasticsearchConfig.java
+++ b/oap-server/server-storage-plugin/storage-elasticsearch-plugin/src/main/java/org/apache/skywalking/oap/server/storage/plugin/elasticsearch/StorageModuleElasticsearchConfig.java
@@ -89,37 +89,6 @@ public class StorageModuleElasticsearchConfig extends ModuleConfig {
     @Setter
     private int profileTaskQueryMaxSize = 200;
     @Setter
-    private int recordDataTTL = 7;
-    @Setter
-    private int minuteMetricsDataTTL = 2;
-    @Setter
-    private int hourMetricsDataTTL = 2;
-    @Setter
-    private int dayMetricsDataTTL = 2;
-    private int otherMetricsDataTTL = 0;
-    @Setter
-    private int monthMetricsDataTTL = 18;
-    @Setter
     private String advanced;
 
-    public int getMinuteMetricsDataTTL() {
-        if (otherMetricsDataTTL > 0) {
-            return otherMetricsDataTTL;
-        }
-        return minuteMetricsDataTTL;
-    }
-
-    public int getHourMetricsDataTTL() {
-        if (otherMetricsDataTTL > 0) {
-            return otherMetricsDataTTL;
-        }
-        return hourMetricsDataTTL;
-    }
-
-    public int getDayMetricsDataTTL() {
-        if (otherMetricsDataTTL > 0) {
-            return otherMetricsDataTTL;
-        }
-        return dayMetricsDataTTL;
-    }
 }