[FEATURE] Tool development for Search Monitor Tool

[minalsha]

Is your feature request related to a problem?
Agent framework (#1161 ) needs tools to extend functionality. This issue propose to add search monitor and alert tools to it.

Search Alerting Monitors By Index: use this tool to search alerting monitors by index name in the OpenSearch cluster. This tool takes the index name as input

What solution would you like?

Agent framework (#1161 ) will provide a general tool framework. We can build search monitor/alerts tools with that framework.

1. Build against the Tool interface on the agent_framework_dev branch: https://github.com/opensearch-project/ml-commons/blob/feature/agent_framework_dev/spi/src/main/java/org/opensearch/ml/common/spi/tools/Tool.java
2. Review example tools in the Agent Framework POC commit: 1b85cff where there are 6 tools under ml-algorithms/src/main/java/org/opensearch/ml/engine/tools/. A good example is the CatIndices tool: https://github.com/opensearch-project/ml-commons/blob/feature/agent_framework_dev/ml-algorithms/src/main/java/org/opensearch/ml/engine/tools/CatIndexTool.java which shows how to use the NodeClient (IndicesAdminClient) to fetch Cluster Health statistics.
3. Implement a similar tool using OpenSearch search functionality for Alerting Monitors by index name.

What alternatives have you considered?
N/A

Do you have any additional context?
#1161

[ohltyler]

Sample json body to search monitors API. Each clause corresponds to a param we can expose from the tool. The tool will generate this query.

{
    "query": {
        // list of clauses under the bool.must array
        // will omit all of below if all of triggers / monitor name pattern / monitor name / monitor enabled / input indices are null
        // if so, it is ok if the must array is empty, will just return everything
        "bool": {
            "must": [
                // triggers - will omit if nothing, else use must / must_not for triggers / no triggers, respectively
                {
                    "bool" : {
                        "must": [ // swap out must or must_not to include/exclude populated triggers or not
                            {
                                "nested": {
                                    "path": "monitor.triggers",
                                    "query": {
                                        "exists": {
                                            "field": "monitor.triggers"
                                        }
                                    }
                                } 
                            }
                        ]
                    }
                },
                // monitor name pattern / wildcard - will omit if nothing
                {
                    "wildcard": {
                        "monitor.name.keyword": {
                            "value": "*"
                        }
                    }
                },
                // explicit monitor name - will omit if nothing
                {
                   "term": {
                       "monitor.name.keyword": "ztest-monitor"
                   } 
                },
                // monitor enabled or not - will omit if nothing
                {
                    "term": {
                        "monitor.enabled": true
                    }
                },
                // monitor input indices - will omit if nothing
                {
                    "nested": {
                        "path": "monitor.inputs",
                        "query": {
                            "wildcard": {
                                "monitor.inputs.search.indices": {
                                    "value": "movies"
                                }
                            }
                        }
                    }
                }
            ]
        }
    },
    "size": 20,
    "from": 0,
    "sort": {
        "monitor.name.keyword": "asc"
    }
}

[dhrubo-os]

Closing this issue as we already developed this tool in skill plugin.