Elasticsearch
Send logs to Elasticsearch (including Amazon OpenSearch Service)
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.
AWS_Auth
Enable AWS Sigv4 Authentication for Amazon OpenSearch Service
Off
AWS_Region
Specify the AWS region for Amazon OpenSearch Service
AWS_STS_Endpoint
Specify the custom sts endpoint to be used with STS API for Amazon OpenSearch Service
AWS_Role_ARN
AWS IAM Role to assume to put records to your Amazon cluster
AWS_External_ID
External ID for the AWS IAM Role specified with aws_role_arn
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>.
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 _id for outgoing records. This prevents duplicate records when retrying ES.
Off
Id_Key
If set, _id will be the value of the key from incoming record and Generate_ID option is ignored.
Write_Operation
The write_operation can be any of: create (default), index, update, upsert.
create
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 Type option is ignored. Types are deprecated in APIs in v7.0. This options is for v7.0 or later.
Off
Workers
Enables dedicated thread(s) for this output. Default value is set since version 1.8.13. For previous versions is 0.
2
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:
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 '*'

Configuration File

In your main configuration file append the following Input & Output sections. You can visualize this configuration here
[INPUT]
Name cpu
Tag cpu
[OUTPUT]
Name es
Match *
Host 192.168.2.3
Port 9200
Index my_index
Type my_type
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:
{"cpu0.p_cpu"=>17.000000}
becomes
{"cpu0_p_cpu"=>17.000000}

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.
[OUTPUT]
Name es
Match foo.*
Index search
Type type1
[OUTPUT]
Name es
Match bar.*
Index search
Type 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.

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:
[OUTPUT]
Name es
Match *
Host vpc-test-domain-ke7thhzoo7jawsrhmm6mb7ite7y.us-west-2.es.amazonaws.com
Port 443
Index my_index
AWS_Auth On
AWS_Region us-west-2
tls On
Type doc

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:
[OUTPUT]
Name es
Match *
Host vpc-test-domain-ke7thhzoo7jawsrhmm6mb7ite7y.us-west-2.es.amazonaws.com
Port 443
Index my_index
Type my_type
AWS_Auth On
AWS_Region us-west-2
tls On
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:
[OUTPUT]
Name es
Include_Tag_Key true
Tag_Key tags
tls On
tls.verify Off
Suppress_Type_Name On
cloud_id elastic-obs-deployment:ZXVybxxxxxxxxxxxg==
cloud_auth elastic:2vxxxxxxxxYV

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:
[OUTPUT]
Name es
Match *
Host 192.168.12.1
Generate_ID on

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:
{"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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Outline
Configuration Parameters
TLS / SSL
write_operation
Getting Started
Command Line
Configuration File
About Elasticsearch field names
FAQ
Elasticsearch rejects requests saying "the final mapping would have more than 1 type"
Elasticsearch rejects requests saying "Document mapping type name can't start with '_'"
Fluent Bit + Amazon OpenSearch Service
Fluent Bit + Elastic Cloud
Validation Failed: 1: an id must be provided if version type or value are set
Action/metadata contains an unknown parameter type