feat: Add Azure AI Search integration

.github/workflows/azure_ai_search.yml

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+# This workflow comes from https://github.com/ofek/hatch-mypyc
+# https://github.com/ofek/hatch-mypyc/blob/5a198c0ba8660494d02716cfc9d79ce4adfb1442/.github/workflows/test.yml
+name: Test / azure_ai_search
+
+on:
+  schedule:
+    - cron: "0 0 * * *"
+  pull_request:
+    paths:
+      - "integrations/azure_ai_search/**"
+      - ".github/workflows/azure_ai_search.yml"
+
+concurrency:
+  group: azure_ai_search-${{ github.head_ref }}
+  cancel-in-progress: true
+
+env:
+  PYTHONUNBUFFERED: "1"
+  FORCE_COLOR: "1"
+  AZURE_SEARCH_API_KEY: ${{ secrets.AZURE_SEARCH_API_KEY }}
+  AZURE_SEARCH_SERVICE_ENDPOINT: ${{ secrets.AZURE_SEARCH_SERVICE_ENDPOINT }}
+
+defaults:
+  run:
+    working-directory: integrations/azure_ai_search
+
+jobs:
+  run:
+    name: Python ${{ matrix.python-version }} on ${{ startsWith(matrix.os, 'macos-') && 'macOS' || startsWith(matrix.os, 'windows-') && 'Windows' || 'Linux' }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [ubuntu-latest]
+        python-version: ["3.8", "3.9", "3.10", "3.11"]
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Python ${{ matrix.python-version }}
+        uses: actions/setup-python@v5
+        with:
+          python-version: ${{ matrix.python-version }}
+
+      - name: Install Hatch
+        run: pip install --upgrade hatch
+
+      - name: Lint
+        if: matrix.python-version == '3.9'
+        run: hatch run lint:all
+
+      - name: Generate docs
+        if: matrix.python-version == '3.9' && runner.os == 'Linux'
+        run: hatch run docs
+
+      - name: Run tests
+        run: hatch run cov-retry
+
+      - name: Nightly - run unit tests with Haystack main branch
+        if: github.event_name == 'schedule'
+        run: |
+          hatch run pip install git+https://github.com/deepset-ai/haystack.git
+          hatch run cov-retry -m "not integration"
+
+      - name: Send event to Datadog for nightly failures
+        if: failure() && github.event_name == 'schedule'
+        uses: ./.github/actions/send_failure
+        with:
+          title: |
+            Core integrations nightly tests failure: ${{ github.workflow }}
+          api-key: ${{ secrets.CORE_DATADOG_API_KEY }}

integrations/azure_ai_search/LICENSE

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integrations/azure_ai_search/README.md

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+# Azure AI Search Document Store for Haystack
+
+[![PyPI - Version](https://img.shields.io/pypi/v/azure-ai-search-haystack.svg)](https://pypi.org/project/azure-ai-search-haystack)
+[![PyPI - Python Version](https://img.shields.io/pypi/pyversions/azure-ai-search-haystack.svg)](https://pypi.org/project/azure-ai-search-haystack)
+
+-----
+
+**Table of Contents**
+
+- [Azure AI Search Document Store for Haystack](#azure-ai-search-document-store-for-haystack)
+  - [Installation](#installation)
+  - [Examples](#examples)
+  - [License](#license)
+
+## Installation
+
+```console
+pip install azure-ai-search-haystack
+```
+
+## Examples
+You can find a code example showing how to use the Document Store and the Retriever in the documentation or in [this Colab](https://colab.research.google.com/drive/1YpDetI8BRbObPDEVdfqUcwhEX9UUXP-m?usp=sharing).
+
+## License
+
+`azure-ai-search-haystack` is distributed under the terms of the [Apache-2.0](https://spdx.org/licenses/Apache-2.0.html) license.

integrations/azure_ai_search/example/document_store.py

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+from haystack import Document
+from haystack.document_stores.types import DuplicatePolicy
+
+from haystack_integrations.document_stores.azure_ai_search import AzureAISearchDocumentStore
+
+"""
+This example demonstrates how to use the AzureAISearchDocumentStore to write and filter documents.
+To run this example, you'll need an Azure Search service endpoint and API key, which can either be
+set as environment variables (AZURE_SEARCH_SERVICE_ENDPOINT and AZURE_SEARCH_API_KEY) or
+provided directly to AzureAISearchDocumentStore(as params "api_key", "azure_endpoint").
+Otherwise you can use DefaultAzureCredential to authenticate with Azure services.
+See more details at https://learn.microsoft.com/en-us/azure/search/keyless-connections?tabs=python%2Cazure-cli
+"""
+document_store = AzureAISearchDocumentStore(
+    metadata_fields={"version": float, "label": str},
+    index_name="document-store-example",
+)
+
+documents = [
+    Document(
+        content="Use pip to install a basic version of Haystack's latest release: pip install farm-haystack.",
+        meta={"version": 1.15, "label": "first"},
+    ),
+    Document(
+        content="Use pip to install a Haystack's latest release: pip install farm-haystack[inference].",
+        meta={"version": 1.22, "label": "second"},
+    ),
+    Document(
+        content="Use pip to install only the Haystack 2.0 code: pip install haystack-ai.",
+        meta={"version": 2.0, "label": "third"},
+    ),
+]
+document_store.write_documents(documents, policy=DuplicatePolicy.SKIP)
+
+filters = {
+    "operator": "AND",
+    "conditions": [
+        {"field": "meta.version", "operator": ">", "value": 1.21},
+        {"field": "meta.label", "operator": "in", "value": ["first", "third"]},
+    ],
+}
+
+results = document_store.filter_documents(filters)
+print(results)