Elasticsearch
The es output plugin, allows to ingest your records into an Elasticsearch database. The following instructions assumes that you have a fully operational Elasticsearch service running in your environment.
Key | Description | default |
Host | IP address or hostname of the target Elasticsearch instance | 127.0.0.1 |
Port | TCP port of the target Elasticsearch instance | 9200 |
Path | Elasticsearch accepts new data on HTTP query path "/_bulk". But it is also possible to serve Elasticsearch behind a reverse proxy on a subpath. This option defines such path on the fluent-bit side. It simply adds a path prefix in the indexing HTTP POST URI. | Empty string |
Buffer_Size | Specify the buffer size used to read the response from the Elasticsearch HTTP service. This option is useful for debugging purposes where is required to read full responses, note that response size grows depending of the number of records inserted. To set an unlimited amount of memory set this value to False, otherwise the value must be according to the Unit Size specification. | 4KB |
Pipeline | Newer versions of Elasticsearch allows to setup filters called pipelines. This option allows to define which pipeline the database should use. For performance reasons is strongly suggested to do parsing and filtering on Fluent Bit side, avoid pipelines. | ​ |
AWS_Auth | Enable AWS Sigv4 Authentication for Amazon ElasticSearch Service | Off |
AWS_Region | Specify the AWS region for Amazon ElasticSearch Service | ​ |
AWS_STS_Endpoint | Specify the custom sts endpoint to be used with STS API for Amazon ElasticSearch Service | ​ |
AWS_Role_ARN | AWS IAM Role to assume to put records to your Amazon ES cluster | ​ |
AWS_External_ID | External ID for the AWS IAM Role specified with | ​ |
Cloud_ID | If you are using Elastic's Elasticsearch Service you can specify the cloud_id of the cluster running | ​ |
Cloud_Auth | Specify the credentials to use to connect to Elastic's Elasticsearch Service running on Elastic Cloud | ​ |
HTTP_User | Optional username credential for Elastic X-Pack access | ​ |
HTTP_Passwd | Password for user defined in HTTP_User | ​ |
Index | Index name | fluent-bit |
Type | Type name | _doc |
Logstash_Format | Enable Logstash format compatibility. This option takes a boolean value: True/False, On/Off | Off |
Logstash_Prefix | When Logstash_Format is enabled, the Index name is composed using a prefix and the date, e.g: If Logstash_Prefix is equals to 'mydata' your index will become 'mydata-YYYY.MM.DD'. The last string appended belongs to the date when the data is being generated. | logstash |
Logstash_DateFormat | Time format (based on strftime) to generate the second part of the Index name. | %Y.%m.%d |
Time_Key | When Logstash_Format is enabled, each record will get a new timestamp field. The Time_Key property defines the name of that field. | @timestamp |
Time_Key_Format | When Logstash_Format is enabled, this property defines the format of the timestamp. | %Y-%m-%dT%H:%M:%S |
Time_Key_Nanos | When Logstash_Format is enabled, enabling this property sends nanosecond precision timestamps. | Off |
Include_Tag_Key | When enabled, it append the Tag name to the record. | Off |
Tag_Key | When Include_Tag_Key is enabled, this property defines the key name for the tag. | _flb-key |
Generate_ID | When enabled, generate | Off |
Id_Key | If set, | ​ |
Replace_Dots | When enabled, replace field name dots with underscore, required by Elasticsearch 2.0-2.3. | Off |
Trace_Output | When enabled print the elasticsearch API calls to stdout (for diag only) | Off |
Trace_Error | When enabled print the elasticsearch API calls to stdout when elasticsearch returns an error (for diag only) | Off |
Current_Time_Index | Use current time for index generation instead of message record | Off |
Logstash_Prefix_Key | When included: the value in the record that belongs to the key will be looked up and over-write the Logstash_Prefix for index generation. If the key/value is not found in the record then the Logstash_Prefix option will act as a fallback. Nested keys are not supported (if desired, you can use the nest filter plugin to remove nesting) | ​ |
Suppress_Type_Name | When enabled, mapping types is removed and | Off |
The parameters index and type can be confusing if you are new to Elastic, if you have used a common relational database before, they can be compared to the database and table concepts. Also see the FAQ below​
Elasticsearch output plugin supports TTL/SSL, for more details about the properties available and general configuration, please refer to the TLS/SSL section.
In order to insert records into a Elasticsearch service, you can run the plugin from the command line or through the configuration file:
The es plugin, can read the parameters from the command line in two ways, through the -p argument (property) or setting them directly through the service URI. The URI format is the following:
es://host:port/index/type
Using the format specified, you could start Fluent Bit through:
$ fluent-bit -i cpu -t cpu -o es://192.168.2.3:9200/my_index/my_type \-o stdout -m '*'
which is similar to do:
$ fluent-bit -i cpu -t cpu -o es -p Host=192.168.2.3 -p Port=9200 \-p Index=my_index -p Type=my_type -o stdout -m '*'
In your main configuration file append the following Input & Output sections. You can visualize this configuration here​
[INPUT]Name cpuTag cpu​[OUTPUT]Name esMatch *Host 192.168.2.3Port 9200Index my_indexType my_type
Some input plugins may generate messages where the field names contains dots, since Elasticsearch 2.0 this is not longer allowed, so the current es plugin replaces them with an underscore, e.g:
{"cpu0.p_cpu"=>17.000000}
becomes
{"cpu0_p_cpu"=>17.000000}
Since Elasticsearch 6.0, you cannot create multiple types in a single index. This means that you cannot set up your configuration as below anymore.
[OUTPUT]Name esMatch foo.*Index searchType type1​[OUTPUT]Name esMatch bar.*Index searchType type2
If you see an error message like below, you'll need to fix your configuration to use a single type on each index.
Rejecting mapping update to [search] as the final mapping would have more than 1 type
For details, please read the official blog post on that issue.
Fluent Bit v1.5 changed the default mapping type from flb_type to _doc, which matches the recommendation from Elasticsearch from version 6.2 forwards (see commit with rationale). This doesn't work in Elasticsearch versions 5.6 through 6.1 (see Elasticsearch discussion and fix). Ensure you set an explicit map (such as doc or flb_type) in the configuration, as seen on the last line:
[OUTPUT]Name esMatch *Host vpc-test-domain-ke7thhzoo7jawsrhmm6mb7ite7y.us-west-2.es.amazonaws.comPort 443Index my_indexAWS_Auth OnAWS_Region us-west-2tls OnType doc
The Amazon ElasticSearch Service adds an extra security layer where HTTP requests must be signed with AWS Sigv4. Fluent Bit v1.5 introduced full support for Amazon ElasticSearch Service with IAM Authentication.
Fluent Bit supports sourcing AWS credentials from any of the standard sources (for example, an Amazon EKS IAM Role for a Service Account).
Example configuration:
[OUTPUT]Name esMatch *Host vpc-test-domain-ke7thhzoo7jawsrhmm6mb7ite7y.us-west-2.es.amazonaws.comPort 443Index my_indexType my_typeAWS_Auth OnAWS_Region us-west-2tls On
Notice that the Port is set to 443, tls is enabled, and AWS_Region is set.
Fluent Bit supports connecting to Elastic Cloud providing just the cloud_id and the cloud_auth settings.
Example configuration:
[OUTPUT]Name esInclude_Tag_Key trueTag_Key tagstls Ontls.verify Offcloud_id elastic-obs-deployment:ZXVybxxxxxxxxxxxg==cloud_auth elastic:2vxxxxxxxxYV
