---
id: 93670178-f6b3-4e8c-9ac2-b0af11f8a1e9
---

# Elastic Search Caching Issue

---
The Elastic Search Caching Issue is a common incident type where the caching feature of Elastic Search is not functioning as expected. This can cause delays or errors in retrieving search results and can impact the performance of the entire system. The issue typically requires troubleshooting and configuration changes to resolve.
### Parameters
```shell
export ES_HOST="PLACEHOLDER"
export ES_INDEX="PLACEHOLDER"
export ES_URL="PLACEHOLDER"
export REQUESTS_PER_SECOND="PLACEHOLDER"
```
## Debug

### Check if Elastic Search is running
```shell
systemctl status elasticsearch
```

### Check the Elastic Search cluster health
```shell
curl  -XGET  '${ES_HOST}:9200/_cluster/health?pretty'
```

### Check the Elastic Search index settings
```shell
curl  -XGET  '${ES_HOST}:9200/${ES_INDEX}/_settings?pretty'
```

### Check the Elastic Search index mapping
```shell
curl  -XGET  '${ES_HOST}:9200/${ES_INDEX}/_mapping?pretty'
```

### Disable caching for a specific index if needed
```shell
curl  -XPUT  '${ES_HOST}:9200/${ES_INDEX}/_settings'  -H  'Content-Type: application/json'  -d  '{"index": {"cache": {"query": {"enabled": false}}}}'
```

### Clear the Elastic Search cache if needed
```shell
curl  -XPOST  '${ES_HOST}:9200/_cache/clear'
```

### Check the Elastic Search cache stats
```shell
curl  -XGET  '${ES_HOST}:9200/_nodes/stats/indices/query_cache?pretty'
```

### The Elastic Search cluster might have been overloaded with requests, causing the caching mechanism to fail and leading to slow response times.
```shell
#!/bin/bash

# Set variables
ELASTICSEARCH_URL=${ES_URL}
REQUESTS_PER_SECOND=${REQUESTS_PER_SECOND}

# Check if Elastic Search is responding
curl  -s  -o /dev/null -w  "%{http_code}\n"  $ELASTICSEARCH_URL
if [ $?  -ne  0 ]; then
echo  "Error: Elastic Search is not responding."
exit  1
fi

# Check if there are any network issues
ping  -c  4  $ELASTICSEARCH_URL
if [ $?  -ne  0 ]; then
echo  "Error: There are network issues between the server and Elastic Search."
exit  1
fi

# Check the current load on the server
load=$(uptime | awk -F'[a-z]:' '{ print $2 }' | awk '{ print $1 }')
if [ $(echo "$load > 2" | bc)  -ne  0 ]; then
echo  "Warning: The server load is high."
fi

# Check the current number of requests per second to Elastic Search
requests=$(curl -s $ELASTICSEARCH_URL/_nodes/stats/indices/search | grep -oP "query_total\"\:\K\d+")
if [ $requests  -gt  $REQUESTS_PER_SECOND ]; then
echo  "Warning: The current number of requests per second to Elastic Search is high."
fi

# Check if Elastic Search is using the caching mechanism
cache_enabled=$(curl -s $ELASTICSEARCH_URL/_nodes/stats/indices/search | grep -oP "cache\:\s*\{.*\}" | grep -oP "memory_cache\:\s*\{.*\}" | grep -oP "enabled\"\:\s*\K.*?(?=\,)")
if [ "$cache_enabled" = "false" ]; then
echo "Error: Caching is not enabled in Elastic Search."
exit 1
fi

echo "Diagnosis complete. No issues found."
exit 0
```

## Repair

### Clear the cache on Elastic Search manually or programmatically.
```shell
#!/bin/bash

# Set the Elastic Search URL
ELASTICSEARCH_URL=${ES_URL}

# Set the Elastic Search index
ELASTICSEARCH_INDEX=${ES_INDEX}

# Clear the cache
curl  -XPOST  "$ELASTICSEARCH_URL/$ELASTICSEARCH_INDEX/_cache/clear"
```

The Elastic Search Caching Issue is a common incident type where the caching feature of Elastic Search is not functioning as expected. This can cause delays or errors in retrieving search results and can impact the performance of the entire system. The issue typically requires troubleshooting and configuration changes to resolve.


```shell
export ES_HOST="PLACEHOLDER"
export ES_INDEX="PLACEHOLDER"
export ES_URL="PLACEHOLDER"
export REQUESTS_PER_SECOND="PLACEHOLDER"
```


### Check if Elastic Search is running

```shell
systemctl status elasticsearch
```

### Check the Elastic Search cluster health

```shell
curl  -XGET  '${ES_HOST}:9200/_cluster/health?pretty'
```

### Check the Elastic Search index settings

```shell
curl  -XGET  '${ES_HOST}:9200/${ES_INDEX}/_settings?pretty'
```

### Check the Elastic Search index mapping

```shell
curl  -XGET  '${ES_HOST}:9200/${ES_INDEX}/_mapping?pretty'
```

### Disable caching for a specific index if needed

```shell
curl  -XPUT  '${ES_HOST}:9200/${ES_INDEX}/_settings'  -H  'Content-Type: application/json'  -d  '{"index": {"cache": {"query": {"enabled": false}}}}'
```

### Clear the Elastic Search cache if needed

```shell
curl  -XPOST  '${ES_HOST}:9200/_cache/clear'
```

### Check the Elastic Search cache stats

```shell
curl  -XGET  '${ES_HOST}:9200/_nodes/stats/indices/query_cache?pretty'
```

### The Elastic Search cluster might have been overloaded with requests, causing the caching mechanism to fail and leading to slow response times.

```shell
#!/bin/bash

# Set variables
ELASTICSEARCH_URL=${ES_URL}
REQUESTS_PER_SECOND=${REQUESTS_PER_SECOND}

# Check if Elastic Search is responding
curl  -s  -o /dev/null -w  "%{http_code}\n"  $ELASTICSEARCH_URL
if [ $?  -ne  0 ]; then
echo  "Error: Elastic Search is not responding."
exit  1
fi

# Check if there are any network issues
ping  -c  4  $ELASTICSEARCH_URL
if [ $?  -ne  0 ]; then
echo  "Error: There are network issues between the server and Elastic Search."
exit  1
fi

# Check the current load on the server
load=$(uptime | awk -F'[a-z]:' '{ print $2 }' | awk '{ print $1 }')
if [ $(echo "$load > 2" | bc)  -ne  0 ]; then
echo  "Warning: The server load is high."
fi

# Check the current number of requests per second to Elastic Search
requests=$(curl -s $ELASTICSEARCH_URL/_nodes/stats/indices/search | grep -oP "query_total\"\:\K\d+")
if [ $requests  -gt  $REQUESTS_PER_SECOND ]; then
echo  "Warning: The current number of requests per second to Elastic Search is high."
fi

# Check if Elastic Search is using the caching mechanism
cache_enabled=$(curl -s $ELASTICSEARCH_URL/_nodes/stats/indices/search | grep -oP "cache\:\s*\{.*\}" | grep -oP "memory_cache\:\s*\{.*\}" | grep -oP "enabled\"\:\s*\K.*?(?=\,)")
if [ "$cache_enabled" = "false" ]; then
echo "Error: Caching is not enabled in Elastic Search."
exit 1
fi

echo "Diagnosis complete. No issues found."
exit 0
```


### Clear the cache on Elastic Search manually or programmatically.

```shell
#!/bin/bash

# Set the Elastic Search URL
ELASTICSEARCH_URL=${ES_URL}

# Set the Elastic Search index
ELASTICSEARCH_INDEX=${ES_INDEX}

# Clear the cache
curl  -XPOST  "$ELASTICSEARCH_URL/$ELASTICSEARCH_INDEX/_cache/clear"
```


Elastic Search Caching Issue

Overview

Parameters

Debug

Check if Elastic Search is running

Check the Elastic Search cluster health

Check the Elastic Search index settings

Check the Elastic Search index mapping

Disable caching for a specific index if needed

Clear the Elastic Search cache if needed

Check the Elastic Search cache stats

The Elastic Search cluster might have been overloaded with requests, causing the caching mechanism to fail and leading to slow response times.

Repair

Clear the cache on Elastic Search manually or programmatically.

Learn more

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