set connection TTL

[yas-okadatech]

Rarely, error "The target server failed to respond" happens.
If a disconnected connection (in connection pool) is reused, this error happens.

So I fixed it to set connection TTL. (default value is -1 and it means connections do not expire)

ref: https://docs.aws.amazon.com/AWSJavaSDK/latest/javadoc/com/amazonaws/ClientConfiguration.html#setConnectionTTL-long-

PR Overview

This PR addresses a sporadic "The target server failed to respond" error by setting the connection TTL in the client configuration to 30 seconds.

• Sets the connection TTL from the default (-1) to 30 seconds.
• Aims to mitigate issues caused by reusing disconnected connections in the connection pool.

Reviewed Changes

File	Description
src/main/java/org/embulk/input/cloudwatch_logs/AbstractCloudwatchLogsInputPlugin.java	Updated client configuration to set a connection TTL of 30 seconds

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Comments suppressed due to low confidence (1)

src/main/java/org/embulk/input/cloudwatch_logs/AbstractCloudwatchLogsInputPlugin.java:228

• [nitpick] Consider making the TTL value configurable rather than hardcoding it to 30 seconds to better accommodate varying deployment environments and usage patterns.

clientConfig.setConnectionTTL(30 * 1000); // default: -1

[kentoyoshida]

Thanks for the fix! LGTM!