Correct copyright notices to reflect Copyright OpenSearch Contributors

[dblock]

Coming from opensearch-project/.github#21.

The correct copyright for open-source projects in opensearch-project is "Copyright OpenSearch Contributors". Please correct any places that say otherwise, especially where it says copyright Amazon. Make sure NOTICE.txt and README match. See opensearch-project/.github#24 for an example.

[ylwu-amzn]

We keep the old copyright for all class files created in ODFE, for example https://github.com/opensearch-project/anomaly-detection/blob/main/src/main/java/org/opensearch/ad/AnomalyDetectorPlugin.java#L13-L24

Should we remove this old copyright no matter if the file created in ODFE or not?
If yes, should we remove this old copyright in branch 1.0?

[ylwu-amzn]

How about we change the label ? bug label seems misleading

[dblock]

You do not need to keep old Amazon copyright from ODFE in the code as we're rewriting it to be OpenSearch Contributors, we had consulted legal on this.

You should make changes on main, do not backport to 1.0 (and probably no time to backport to 1.1 either).

[ylwu-amzn]

Got it. Sure, will remove the old Amazon copyright and merge to main branch.

[CEHENKLE]

@ylwu-amzn Hey, can this issue be closed? Do you think you caught everything in #257 ?

Thanks!
/C

[ylwu-amzn]

Kept the issue as we haven't fixed frontend package. Now frontend copyright fixed opensearch-project/anomaly-detection-dashboards-plugin#118, will close this issue.

[AMoo-Miki]

The correct header for this one is:

/*
 * Copyright OpenSearch Contributors
 * SPDX-License-Identifier: Apache-2.0
 */

[ylwu-amzn]

The correct header for this one is:

/*
 * Copyright OpenSearch Contributors
 * SPDX-License-Identifier: Apache-2.0
 */

Thanks @AMoo-Miki , this file anomaly-detection/src/forbidden/ad-signatures.txt is to define which copyright is wrong,