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.
Configuration Parameters
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.
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AWS_Auth
Enable AWS Sigv4 Authentication for Amazon OpenSearch Service
Off
AWS_Region
Specify the AWS region for Amazon OpenSearch Service
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AWS_STS_Endpoint
Specify the custom sts endpoint to be used with STS API for Amazon OpenSearch Service
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AWS_Role_ARN
AWS IAM Role to assume to put records to your Amazon cluster
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AWS_External_ID
External ID for the AWS IAM Role specified with aws_role_arn
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Cloud_ID
If you are using Elastic's Elasticsearch Service you can specify the cloud_id of the cluster running. The Cloud ID string has the format <deployment_name>:<base64_info>. Once decoded, the base64_info string has the format <deployment_region>lt;elasticsearch_hostname>lt;kibana_hostname>.
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Cloud_Auth
Specify the credentials to use to connect to Elastic's Elasticsearch Service running on Elastic Cloud
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HTTP_User
Optional username credential for Elastic X-Pack access
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HTTP_Passwd
Password for user defined in HTTP_User
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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
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​
TLS / SSL
Elasticsearch output plugin supports TTL/SSL, for more details about the properties available and general configuration, please refer to the TLS/SSL section.
write_operation
The write_operation can be any of:
Operation
Description
create (default)
adds new data - if the data already exists (based on its id), the op is skipped.
index
new data is added while existing data (based on its id) is replaced (reindexed).
update
updates existing data (based on its id). If no data is found, the op is skipped.
upsert
known as merge or insert if the data does not exist, updates if the data exists (based on its id).
Please note, Id_Key or Generate_ID is required in update, and upsert scenario.
Getting Started
In order to insert records into a Elasticsearch service, you can run the plugin from the command line or through the configuration file:
Command Line
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:
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es://host:port/index/type
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Using the format specified, you could start Fluent Bit through:
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$ fluent-bit -i cpu -t cpu -o es://192.168.2.3:9200/my_index/my_type \
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    -o stdout -m '*'
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which is similar to do:
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$ fluent-bit -i cpu -t cpu -o es -p Host=192.168.2.3 -p Port=9200 \
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    -p Index=my_index -p Type=my_type -o stdout -m '*'
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Configuration File
In your main configuration file append the following Input & Output sections. You can visualize this configuration here​
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[INPUT]
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    Name  cpu
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    Tag   cpu
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​
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[OUTPUT]
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    Name  es
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    Match *
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    Host  192.168.2.3
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    Port  9200
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    Index my_index
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    Type  my_type
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example configuration visualization from config.calyptia.com
About Elasticsearch field names
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:
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{"cpu0.p_cpu"=>17.000000}
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becomes
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{"cpu0_p_cpu"=>17.000000}
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FAQ
Elasticsearch rejects requests saying "the final mapping would have more than 1 type"
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.
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[OUTPUT]
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    Name  es
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    Match foo.*
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    Index search
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    Type  type1
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​
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[OUTPUT]
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    Name  es
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    Match bar.*
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    Index search
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    Type  type2
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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.
Elasticsearch rejects requests saying "Document mapping type name can't start with '_'"
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:
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[OUTPUT]
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    Name  es
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    Match *
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    Host  vpc-test-domain-ke7thhzoo7jawsrhmm6mb7ite7y.us-west-2.es.amazonaws.com
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    Port  443
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    Index my_index
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    AWS_Auth On
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    AWS_Region us-west-2
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    tls   On
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    Type  doc
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Fluent Bit + Amazon OpenSearch Service
The Amazon OpenSearch Service adds an extra security layer where HTTP requests must be signed with AWS Sigv4. Fluent Bit v1.5 introduced full support for Amazon OpenSearch Service with IAM Authentication.
See here for details on how AWS credentials are fetched.
Example configuration:
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[OUTPUT]
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    Name  es
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    Match *
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    Host  vpc-test-domain-ke7thhzoo7jawsrhmm6mb7ite7y.us-west-2.es.amazonaws.com
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    Port  443
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    Index my_index
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    Type  my_type
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    AWS_Auth On
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    AWS_Region us-west-2
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    tls     On
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Notice that the Port is set to 443, tls is enabled, and AWS_Region is set.
Fluent Bit + Elastic Cloud
Fluent Bit supports connecting to Elastic Cloud providing just the cloud_id and the cloud_auth settings. cloud_auth uses the elastic user and password provided when the cluster was created, for details refer to the Cloud ID usage page.
Example configuration:
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[OUTPUT]
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    Name es
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    Include_Tag_Key true
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    Tag_Key tags
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    tls On
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    tls.verify Off
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    Suppress_Type_Name On
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    cloud_id elastic-obs-deployment:ZXVybxxxxxxxxxxxg==
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    cloud_auth elastic:2vxxxxxxxxYV
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Validation Failed: 1: an id must be provided if version type or value are set
Since v1.8.2, Fluent Bit started using create method (instead of index) for data submission. This makes Fluent Bit compatible with Datastream introduced in Elasticsearch 7.9.
If you see action_request_validation_exception errors on your pipeline with Fluent Bit >= v1.8.2, you can fix it up by turning on Generate_ID as follows:
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[OUTPUT]
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    Name es
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    Match *
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    Host  192.168.12.1
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    Generate_ID on
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Action/metadata contains an unknown parameter type
Elastic Cloud is now on version 8 so the type option must be removed by setting Suppress_Type_Name On as indicated above.
Without this you will see errors like:
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{"error":{"root_cause":[{"type":"illegal_argument_exception","reason":"Action/metadata line [1] contains an unknown parameter [_type]"}],"type":"illegal_argument_exception","reason":"Action/metadata line [1] contains an unknown parameter [_type]"},"status":400}
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